| 
                                            
                                            
                                                United States Liabilities: Flow: LI: saar: Taxes Payable (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -2.46
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Flow: Life Insurance Companies (LI): saar: Gross Saving (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 22.53
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Flow: LI: saar: Fixed Nonresidential Investment:  (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 22.06
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: Life Insurance Companies (LI): saar (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 34.329
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: Checkable Deposits & Currency (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -11.196
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: Money Market Fund Shares (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -13.584
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: DS: Open Market Paper (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.843
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: DS: Treasury Securities (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 4.240
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: DS: Agency & GSE Backed Securities (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 16.612
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: DS: Municipal Securities (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 7.488
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: DS: Corporate & Foreign Bonds (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 109.360
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: Loans: Other Loans and Advances (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 4.776
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: Loans: Mortgages (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 62.264
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: Corporate Equities (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 46.296
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: Mutual Fund Shares (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -80.472
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: Miscellaneous (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -104.845
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: Life Insurance Companies (LI): saar (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 4.57
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: saar: Corporate Equities Issues (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -12.83
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: saar: Loans (Other Loans & Advances) (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 10.87
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: saar: Life Insurance Reserves (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 10.28
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: saar: Pension Entitlements (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -79.88
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: saar: Miscellaneous (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 61.75
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Discrepancy: Flow: Life Insurance Companies: saar (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -21.99
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Flow: LI: Gross Saving (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 5.63
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Flow: LI: Fixed Nonresidential Investment (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 5.51
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: Life Insurance Companies (LI) (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.674
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: Checkable Deposits & Currency (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -2.799
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: Money Market Fund Shares (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -3.396
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: DS: Open Market Paper (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -2.085
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: DS: Treasury Securities (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1.060
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: DS: Agency & GSE Backed Securities (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 4.153
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: DS: Municipal Securities (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1.872
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: DS: Corporate & Foreign Bonds (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 27.340
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: Loans: Other Loans and Advances (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1.194
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: Loans: Mortgages (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 9.953
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: Corporate Equities (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 11.574
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: Mutual Fund Shares (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -22.711
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: Miscellaneous (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -23.618
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: Life Insurance Companies (LI) (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1.14
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: Corporate Equities Issues (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -3.21
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: Loans (Other Loans & Advances) (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 2.72
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: Life Insurance Reserves (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 2.57
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: Pension Entitlements (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -19.97
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: Taxes Payable (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -0.62
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: Miscellaneous (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 15.44
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Discrepancy: Flow: Life Insurance Companies (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -12.65
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: Life Insurance Companies (LI) (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 7,120.557
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: Checkable Deposits & Currency (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 83.328
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: Money Market Fund Shares (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 43.770
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: DS: Open Market Paper (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 34.122
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: DS: Treasury Securities (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 224.363
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: DS: Agency & GSE Backed Securities (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 381.258
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: DS: Municipal Securities (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 193.816
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: DS: Corporate & Foreign Bonds (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 2,697.464
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: Loans: Other Loans and Advances (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 171.095
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: Loans: Mortgages (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 511.930
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: Corporate Equities (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 511.783
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: Mutual Fund Shares (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1,654.342
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: Miscellaneous (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 543.095
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Outs: Life Insurance Companies (LI) (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 6,520.98
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Outs: LI: Loans (Other Loans and Advances) (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 74.91
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Outs: LI: Life Insurance Reserves (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1,564.11
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Outs: LI: Pension Entitlements (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 3,185.59
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Outs: LI: Taxes Payable (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 2.63
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Outs: LI: Miscellaneous (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1,561.26
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: US Direct Investment Abroad (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -1.665
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: Security Repurchase Agreements (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -0.792
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: US Direct Investment Abroad (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -8.640
            
                                        Jun 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Jun 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: Misc: Equity in FHLB (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1.388
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: Misc: Deferred and Unpaid Life Ins Premium... (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 9.756
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: Misc: Other (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -115.989
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: saar: Security Repurchase Agreements (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -1.60
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: saar: Foreign Direct Investment in US (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 18.44
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: saar: Misc: Investment by Parent Companies (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 4.56
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: saar: Misc: Other Reserves (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 26.10
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: saar: Misc: Unallocated Insurance Contracts (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 24.53
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: saar: Misc: Other (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 10.51
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: Security Repurchase Agreements (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -0.198
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: Misc: Equity in FHLB (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 0.347
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: Misc: Deferred and Unpaid Life Ins Premiums (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 2.439
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: Misc: Other (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -26.404
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: Security Repurchase Agreements (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 -0.40
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: Foreign Direct Investment in US (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 4.61
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: Misc: Inv by Parent Companies (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1.14
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: Misc: Other Reserves (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 6.53
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: Misc: Unallocated Insurance Contracts (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 6.13
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Flow: LI: Misc: Other (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 2.63
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: Debt Securities (DS) (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 32.340
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: Loans (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 11.147
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: Debt Securities (DS) (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 138.543
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Flow: LI: saar: Loans (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 67.040
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: Security Repurchase Agreements (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 1.699
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: Debt Securities (DS) (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 3,531.023
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: Loans (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 683.025
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: US Direct Investment Abroad (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 68.492
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: Misc: Equity in FHLB (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 4.512
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: Misc: Deferred and Unpaid Life Ins Premiums (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 35.520
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Assets: Outs: LI: Misc: Other (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 503.063
            
                                        Mar 2018
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Mar 2018
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Outs: LI: Security Repurchase Agreements (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 22.05
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Outs: LI: Foreign Direct Investment in US (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 110.43
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     | 
                                
                            
                        
                            
                                
                                    
                                        
                                        
                                        | 
                                            
                                            
                                                United States Liabilities: Outs: LI: Misc: Inv by Parent Companies (USD bn)
                                            
                                         | 
                                    
                                    
                                        
                                        
                
                 15.80
            
                                        Dec 2017
                                     | 
                                    
                                    
                                    
                                        quarterly
                                     | 
                                    
                                        Dec 1951 - Dec 2017
                                     |