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Fair Value of Financial Instruments (Fair Value of Assets and Liabilities on a Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | $ 270,478 | $ 233,897
Liabilities measured at fair value |  | (4,306) | (1,793)
Benefit Plans' Assets |  | 1,589 | 1,420
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 |  | 1,215 | 1,340
Benefit Plans' Assets |  | 195 | 158
Significant Observable Inputs (Level 2) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 260,661 | 227,067
Liabilities measured at fair value |  | (845) | (317)
Benefit Plans' Assets |  | 1,394 | 1,262
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 8,602 | 5,490
Liabilities measured at fair value |  | (3,461) | (1,476)
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 88,716 | 80,348
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 |  | 84,435 | 77,079
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 |  | 4,281 | 3,269
ABS [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 4,889 |
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 |  | 4,621 |
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 |  | 268 |
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 |  | 435 | 417
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 |  | 424 | 399
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 |  | 6 | 18
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 |
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 |  | 393 | 448
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 |  | 303 | 339
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 |  | 90 | 109
RMBS [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 3,241 | 3,373
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 |  | 3,230 | 3,366
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 |  | 11 | 7
CMBS [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 1,083 | 804
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 |  | 1,082 | 802
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 | 2
CLOs [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  |  | 2,696
CLOs [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 |  |  | 2,562
CLOs [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 |  |  | 134
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 |  | 5,884 | 5,345
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 |  | 5,884 | 5,345
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 |  | 559 | 593
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 |  | 77 | 67
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 |  | 404 | 451
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 |  | 78 | 75
Trading Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 4,673 | 1,950
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 |  | 50 | 43
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 |  | 3,957 | 1,840
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 |  | 666 | 67
Equity Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 103 | 99
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 |  | 25 | 16
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 |  | 48 | 58
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 |  | 30 | 25
Derivative Investments [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value | [1] | 2,947 | 1,432
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] | 1,212 | 727
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 | [1] | 1,735 | 705
Other Investments [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  |  | 150
Other Investments [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 |  |  | 150
Invested Cash [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 2,563 | 2,345
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 |  | 2,563 | 2,345
GLB Direct Embedded Derivatives [Member] | Other Assets [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 450 | 123
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 |  | 450 | 123
GLB Ceded Embedded Derivatives [Member] | Other Assets [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 60 | 72
GLB Ceded Embedded Derivatives [Member] | Other Liabilities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  | (9) |
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 |  | 60 | 72
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 |  | (9) |
Indexed Annuity And IUL Contracts [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 927 |
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 |  |  | 902
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 |  | (2,585) | (1,305)
Indexed Annuity And IUL Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 927 |
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 |  |  | 902
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 |  | (2,585) | (1,305)
Separate Account Assets [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 153,555 | 132,800
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 |  | 639 | 665
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 |  | 152,916 | 132,135
Reinsurance Related Embedded Derivatives [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  | (327) | (3)
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 |  | (327) | (3)
Derivative Liabilities [Member] | Other Liabilities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value | [1] | (1,385) | (485)
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 | [1] | (518) | (314)
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] | $ (867) | $ (171)
[1] | Derivative investment assets and liabilities are presented within the fair value hierarchy on a gross basis by derivative type and not on a master netting basis by counterparty.

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