| United States Liabilities: Flow: LI: Pension Entitlements (USD bn) | -19.97
            
                                        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: Taxes Payable (USD bn) | -2.46
            
                                        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: 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 |