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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivative [Line Items] |  |
Notional Amount | $ 33,903 | $ 32,104
Carrying Value / Fair Value of Assets | 440 | 510
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 1,156 | 1,196
Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 29,116 | 27,306
Carrying Value / Fair Value of Assets | 416 | 478
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 862 | 949
Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 1,400 | 1,609
Carrying Value / Fair Value of Assets | 5 | 4
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 11 | 3
Not Designated as Hedging Instrument | Foreign Currency Forwards |  |
Derivative [Line Items] |  |
Notional Amount | 2,489 | 809
Carrying Value / Fair Value of Assets | 0 | 36
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 27 | 0
Not Designated as Hedging Instrument | Financial Futures |  |
Derivative [Line Items] |  |
Notional Amount | 211 | 255
Carrying Value / Fair Value of Assets | 0 | 0
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 0 | 0
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 456 | 468
Carrying Value / Fair Value of Assets | 11 | 11
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 2 | 3
Not Designated as Hedging Instrument | Credit Default Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 2,005 | 1,475
Carrying Value / Fair Value of Assets | 4 | 5
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 3 | 1
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts |  |
Derivative [Line Items] |  |
Notional Amount | 15,801 | 16,135
Carrying Value / Fair Value of Assets | 0 | 0
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 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 | 327 | 356
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 421 | 527
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, Subject to Master Netting Arrangement, before Offset of Collateral | 398 | 415
Not Designated as Hedging Instrument | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 150 | 150
Carrying Value / Fair Value of Assets | 39 | 27
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 0 | 0
Not Designated as Hedging Instrument | Interest Rate Swaption |  |
Derivative [Line Items] |  |
Notional Amount | 5,555 | 5,555
Carrying Value / Fair Value of Assets | 3 | 7
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 0 | 0
Not Designated as Hedging Instrument | Total Return Swap |  |
Derivative [Line Items] |  |
Notional Amount | 700 | 500
Carrying Value / Fair Value of Assets | 23 | 24
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 0 | 0
Not Designated as Hedging Instrument | Interest Rate Future |  |
Derivative [Line Items] |  |
Notional Amount | 96 | 97
Carrying Value / Fair Value of Assets | 0 | 0
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 0 | 0
Not Designated as Hedging Instrument | Equity Option |  |
Derivative [Line Items] |  |
Notional Amount | 253 | 253
Carrying Value / Fair Value of Assets | 4 | 8
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 0 | 0
Designated As Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 4,787 | 4,798
Carrying Value / Fair Value of Assets | 24 | 32
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 294 | 247
Designated As Hedging Instrument | Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 1,830 | 1,770
Carrying Value / Fair Value of Assets | 1 | 9
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 97 | 86
Designated As Hedging Instrument | Foreign Currency Forwards |  |
Derivative [Line Items] |  |
Notional Amount | 1,143 | 1,143
Carrying Value / Fair Value of Assets | 15 | 5
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 2 | 17
Designated As Hedging Instrument | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 742 | 809
Carrying Value / Fair Value of Assets | 6 | 7
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | 88 | 64
Designated As Hedging Instrument | Forward Contracts [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 1,072 | 1,076
Carrying Value / Fair Value of Assets | 2 | 11
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral | $ 107 | $ 80

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