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Fair Value of Financial Instruments (Fair Value of Assets and Liabilities on a Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | $ 284,635 | $ 270,478
Liabilities measured at fair value | (6,415) | (4,306)
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 | 1,268 | 1,215
Significant Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 274,546 | 260,661
Liabilities measured at fair value | (1,490) | (845)
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 8,821 | 8,602
Liabilities measured at fair value | (4,925) | (3,461)
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 98,717 | 88,716
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 | 94,165 | 84,435
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 | 4,552 | 4,281
ABS [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 6,590 | 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 | 6,177 | 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 | 413 | 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 | 496 | 435
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 | 459 | 424
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 | 37 | 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
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 | 436 | 393
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 | 370 | 303
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 | 90
RMBS [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 3,203 | 3,241
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 | 3,201 | 3,230
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 | 11
CMBS [Member] | Fixed Maturity AFS Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 1,430 | 1,083
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 | 1,429 | 1,082
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 | 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 | 6,774 | 5,884
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 | 6,774 | 5,884
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 | 606 | 559
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 | 62 | 77
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 | 439 | 404
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 | 105 | 78
Mortgage Loans On Real Estate [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 794 |
Mortgage Loans On Real Estate [Member] | Significant Observable Inputs (Level 2) [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 794 |
Trading Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 4,633 | 4,673
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 | 50
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 | 4,093 | 3,957
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 | 535 | 666
Equity Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 122 | 103
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 | 22 | 25
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 | 49 | 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 | 51 | 30
Derivative Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 4,456 | 2,947
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 | 2,177 | 1,212
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 | 2,279 | 1,735
Cash And Invested Cash [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 2,595 | 2,563
Cash And 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 | 2,595 | 2,563
Reinsurance Related Embedded Derivatives [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Liabilities measured at fair value | (334) | (327)
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 | (334) | (327)
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
GLB Direct Embedded Derivatives [Member] | Other Liabilities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Liabilities measured at fair value | (1,106) |
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
GLB Direct 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 | (1,106) |
GLB Ceded Embedded Derivatives [Member] | Other Assets [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 281 | 60
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 | 281 | 60
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] | Other Assets [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 536 | 927
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 | (2,688) | (2,585)
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 | 536 | 927
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 | (2,688) | (2,585)
Separate Account Assets [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets measured at fair value | 152,966 | 153,555
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 | 720 | 639
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 | 152,246 | 152,916
Derivative Liabilities [Member] | Other Liabilities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Liabilities measured at fair value | (2,287) | (1,385)
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 | (1,156) | (518)
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 | $ (1,131) | $ (867)

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