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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative [Line Items] |  |
Notional Amount | $ 33,433 | $ 33,341
Carrying Value / Fair Value of Assets | 546 | 586
Derivative Liability, Fair Value, Gross Liability | 1,274 | 1,137
Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 28,770 | 30,491
Carrying Value / Fair Value of Assets | 518 | 545
Derivative Liability, Fair Value, Gross Liability | 927 | 927
Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 1,622 | 1,271
Carrying Value / Fair Value of Assets | 7 | 2
Derivative Liability, Fair Value, Gross Liability | 24 | 2
Not Designated as Hedging Instrument | Foreign Currency Forwards |  |
Derivative [Line Items] |  |
Notional Amount | 826 | 766
Carrying Value / Fair Value of Assets | 0 | 50
Derivative Liability, Fair Value, Gross Liability | 24 | 0
Not Designated as Hedging Instrument | Financial Futures |  |
Derivative [Line Items] |  |
Notional Amount | 245 | 164
Carrying Value / Fair Value of Assets | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 445 | 496
Carrying Value / Fair Value of Assets | 12 | 20
Derivative Liability, Fair Value, Gross Liability | 2 | 3
Not Designated as Hedging Instrument | Credit Default Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 1,515 | 1,523
Carrying Value / Fair Value of Assets | 3 | 2
Derivative Liability, Fair Value, Gross Liability | 38 | 21
Not Designated as Hedging Instrument | Equity Options |  |
Derivative [Line Items] |  |
Notional Amount | 282 | 358
Carrying Value / Fair Value of Assets | 14 | 38
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts |  |
Derivative [Line Items] |  |
Notional Amount | 16,535 | 17,411
Carrying Value / Fair Value of Assets | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Carrying Value / Fair Value of Assets | 378 | 363
Derivative Liability, Fair Value, Gross Liability | 368 | 371
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Carrying Value / Fair Value of Assets | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 441 | 530
Not Designated as Hedging Instrument | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 150 | 150
Carrying Value / Fair Value of Assets | 32 | 18
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument | Interest Rate Swaption |  |
Derivative [Line Items] |  |
Notional Amount | 6,555 | 7,756
Carrying Value / Fair Value of Assets | 30 | 34
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument | Total Return Swap |  |
Derivative [Line Items] |  |
Notional Amount | 500 | 500
Carrying Value / Fair Value of Assets | 42 | 18
Derivative Liability, Fair Value, Gross Liability | 30 | 0
Not Designated as Hedging Instrument | Interest Rate Future |  |
Derivative [Line Items] |  |
Notional Amount | 95 | 96
Carrying Value / Fair Value of Assets | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Designated As Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 4,663 | 2,850
Carrying Value / Fair Value of Assets | 28 | 41
Derivative Liability, Fair Value, Gross Liability | 347 | 210
Designated As Hedging Instrument | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 2,340 | 1,310
Carrying Value / Fair Value of Assets | 6 | 3
Derivative Liability, Fair Value, Gross Liability | 180 | 113
Designated As Hedging Instrument | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 104 | 114
Carrying Value / Fair Value of Assets | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 7 | 0
Designated As Hedging Instrument | Forward Contracts [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 1,146 | 1,019
Carrying Value / Fair Value of Assets | 22 | 38
Derivative Liability, Fair Value, Gross Liability | 1 | 1
Designated As Hedging Instrument | Other Contract |  |
Derivative [Line Items] |  |
Notional Amount | 1,073 | 407
Carrying Value / Fair Value of Assets | 0 | 0
Derivative Liability, Fair Value, Gross Liability | $ 159 | $ 96

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