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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative [Line Items] |  |
Notional Amount of Derivatives | $ 32,104 | $ 33,341
Derivative Asset, Fair Value, Gross Asset | 510 | 586
Derivative Liability, Fair Value, Gross Liability | 1,196 | 1,137
Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 27,306 | 30,491
Derivative Asset, Fair Value, Gross Asset | 478 | 545
Derivative Liability, Fair Value, Gross Liability | 949 | 927
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 1,609 | 1,271
Derivative Asset, Fair Value, Gross Asset | 4 | 2
Derivative Liability, Fair Value, Gross Liability | 3 | 2
Not Designated as Hedging Instrument [Member] | Future [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 255 | 164
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 809 | 766
Derivative Asset, Fair Value, Gross Asset | 36 | 50
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Consumer Price Index Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 468 | 496
Derivative Asset, Fair Value, Gross Asset | 11 | 20
Derivative Liability, Fair Value, Gross Liability | 3 | 3
Not Designated as Hedging Instrument [Member] | Credit Default Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 1,475 | 1,523
Derivative Asset, Fair Value, Gross Asset | 5 | 2
Derivative Liability, Fair Value, Gross Liability | 1 | 21
Not Designated as Hedging Instrument [Member] | Synthetic Guaranteed Investment Contracts [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 16,135 | 17,411
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 0 | 0
Derivative Asset, Fair Value, Gross Asset | 356 | 363
Derivative Liability, Fair Value, Gross Liability | 527 | 371
Not Designated as Hedging Instrument [Member] | Embedded Derivatives In Indexed Annuity [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 0 | 0
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 415 | 530
Not Designated as Hedging Instrument [Member] | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 150 | 150
Derivative Asset, Fair Value, Gross Asset | 27 | 18
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Interest Rate Swaption |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 5,555 | 7,756
Derivative Asset, Fair Value, Gross Asset | 7 | 34
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Total Return Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 500 | 500
Derivative Asset, Fair Value, Gross Asset | 24 | 18
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Interest Rate Future |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 97 | 96
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Equity Option |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 253 | 358
Derivative Asset, Fair Value, Gross Asset | 8 | 38
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 4,798 | 2,850
Derivative Asset, Fair Value, Gross Asset | 32 | 41
Derivative Liability, Fair Value, Gross Liability | 247 | 210
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 1,770 | 737
Derivative Asset, Fair Value, Gross Asset | 9 | 3
Derivative Liability, Fair Value, Gross Liability | 86 | 83
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 1,143 | 1,019
Derivative Asset, Fair Value, Gross Asset | 5 | 38
Derivative Liability, Fair Value, Gross Liability | 17 | 1
Designated as Hedging Instrument [Member] | Currency Swap [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 809 | 687
Derivative Asset, Fair Value, Gross Asset | 7 | 0
Derivative Liability, Fair Value, Gross Liability | 64 | 30
Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |
Derivative [Line Items] |  |
Notional Amount of Derivatives | 1,076 | 407
Derivative Asset, Fair Value, Gross Asset | 11 | 0
Derivative Liability, Fair Value, Gross Liability | $ 80 | $ 96

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