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Fair Value of Financial Instruments (Fair Value of Assets and Liabilities on a Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | $ 303,060 | $ 304,561
Liabilities measured at fair value | (6,845) | (7,091)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 1,095 | 1,160
Significant Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 287,680 | 291,333
Liabilities measured at fair value | (941) | (1,464)
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 14,285 | 12,068
Liabilities measured at fair value | (5,904) | (5,627)
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 96,570 | 102,789
Corporate Bonds [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 91,425 | 97,668
Corporate Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 5,145 | 5,121
ABS [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 7,996 | 7,184
ABS [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 7,308 | 6,614
ABS [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 688 | 570
U.S. Government Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 444 | 484
U.S. Government Bonds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 432 | 473
U.S. Government Bonds [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 7 | 6
U.S. Government Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 5 | 5
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 485 | 470
Foreign Government Bonds [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 419 | 396
Foreign Government Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 66 | 74
RMBS [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 3,077 | 3,076
RMBS [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 3,075 | 3,074
RMBS [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 2 | 2
CMBS [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 1,516 | 1,505
CMBS [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 1,515 | 1,505
CMBS [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 1 |
State And Municipal Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 6,625 | 6,921
State And Municipal Bonds [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 6,625 | 6,921
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 600 | 615
Hybrid And Redeemable Preferred Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 56 | 54
Hybrid And Redeemable Preferred Securities [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 459 | 457
Hybrid And Redeemable Preferred Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 85 | 104
Mortgage Loans On Real Estate [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 874 | 832
Mortgage Loans On Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 874 | 832
Trading Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 4,365 | 4,501
Trading Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value |  | 5
Trading Securities [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 3,650 | 3,852
Trading Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 715 | 644
Equity Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 123 | 129
Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 12 | 22
Equity Securities [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 50 | 48
Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 61 | 59
Derivative Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 5,304 | 5,308
Derivative Investments [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 1,061 | 1,733
Derivative Investments [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 4,243 | 3,575
Invested Cash [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 1,350 | 1,708
Invested Cash [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 1,350 | 1,708
Reinsurance Related Embedded Derivatives [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Liabilities measured at fair value | (244) | (392)
Reinsurance Related Embedded Derivatives [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Liabilities measured at fair value | (244) | (392)
GLB Direct Embedded Derivatives [Member] | Other Assets [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 1,831 | 450
GLB Direct Embedded Derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Assets [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 1,831 | 450
GLB Ceded Embedded Derivatives [Member] | Other Assets [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 42 | 82
GLB Ceded Embedded Derivatives [Member] | Other Liabilities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Liabilities measured at fair value | (152) |
GLB Ceded Embedded Derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Assets [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 42 | 82
GLB Ceded Embedded Derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Liabilities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Liabilities measured at fair value | (152) |
Indexed Annuity And IUL Contracts [Member] | Other Assets [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 527 | 550
Indexed Annuity And IUL Contracts [Member] | Future Contract Benefits [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Liabilities measured at fair value | (4,170) | (3,594)
Indexed Annuity And IUL Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Assets [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 527 | 550
Indexed Annuity And IUL Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member] | Future Contract Benefits [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Liabilities measured at fair value | (4,170) | (3,594)
Separate Account Assets [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 171,331 | 167,957
Separate Account Assets [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 595 | 606
Separate Account Assets [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 170,736 | 167,351
Derivative Liabilities [Member] | Other Liabilities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Liabilities measured at fair value | (2,279) | (3,105)
Derivative Liabilities [Member] | Significant Observable Inputs (Level 2) [Member] | Other Liabilities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Liabilities measured at fair value | (697) | (1,072)
Derivative Liabilities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Liabilities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Liabilities measured at fair value | $ (1,582) | $ (2,033)

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