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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative [Line Items] |  |
Notional Amount | $ 33,434 | $ 33,341
Carrying Value / Fair Value of Assets | 483 | 586
Derivative Liability, Fair Value, Gross Liability | 1,122 | 1,137
Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 29,400 | 30,491
Carrying Value / Fair Value of Assets | 463 | 545
Derivative Liability, Fair Value, Gross Liability | 878 | 927
Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 1,683 | 1,271
Carrying Value / Fair Value of Assets | 6 | 2
Derivative Liability, Fair Value, Gross Liability | 4 | 2
Not Designated as Hedging Instrument | Foreign Currency Forwards |  |
Derivative [Line Items] |  |
Notional Amount | 850 | 766
Carrying Value / Fair Value of Assets | 0 | 50
Derivative Liability, Fair Value, Gross Liability | 28 | 0
Not Designated as Hedging Instrument | Financial Futures |  |
Derivative [Line Items] |  |
Notional Amount | 241 | 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 | 477 | 496
Carrying Value / Fair Value of Assets | 14 | 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 | 4 | 2
Derivative Liability, Fair Value, Gross Liability | 10 | 21
Not Designated as Hedging Instrument | Equity Options |  |
Derivative [Line Items] |  |
Notional Amount | 306 | 358
Carrying Value / Fair Value of Assets | 12 | 38
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts |  |
Derivative [Line Items] |  |
Notional Amount | 17,027 | 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 | 368 | 363
Derivative Liability, Fair Value, Gross Liability | 359 | 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 | 472 | 530
Not Designated as Hedging Instrument | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 150 | 150
Carrying Value / Fair Value of Assets | 26 | 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 | 8 | 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 | 25 | 18
Derivative Liability, Fair Value, Gross Liability | 3 | 0
Not Designated as Hedging Instrument | Interest Rate Future |  |
Derivative [Line Items] |  |
Notional Amount | 96 | 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 | 4,034 | 2,850
Carrying Value / Fair Value of Assets | 20 | 41
Derivative Liability, Fair Value, Gross Liability | 244 | 210
Designated As Hedging Instrument | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 1,997 | 1,310
Carrying Value / Fair Value of Assets | 5 | 3
Derivative Liability, Fair Value, Gross Liability | 148 | 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 | 3 | 0
Designated As Hedging Instrument | Forward Contracts [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 1,158 | 1,019
Carrying Value / Fair Value of Assets | 14 | 38
Derivative Liability, Fair Value, Gross Liability | 9 | 1
Designated As Hedging Instrument | Other Contract |  |
Derivative [Line Items] |  |
Notional Amount | 775 | 407
Carrying Value / Fair Value of Assets | 1 | 0
Derivative Liability, Fair Value, Gross Liability | $ 84 | $ 96

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