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Derivative Instruments (Non Hedging Derivatives and Embedded Derivatives Effect on Income Statement) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | $ (79) | $ (149)
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives | (2) | (98)
Interest credited | (299) | (254)
Not Designated as Hedging Instrument |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 11 | (41)
Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 6 | (31)
Not Designated as Hedging Instrument | Financial Futures |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 9 | (17)
Not Designated as Hedging Instrument | Currency Swap [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (3) | 14
Not Designated as Hedging Instrument | Foreign Currency Forwards |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 22 | (64)
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (5) | 0
Not Designated as Hedging Instrument | Credit Default Swaps |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (18) | 2
Not Designated as Hedging Instrument | Equity Options |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (6) | (4)
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (11) | 77
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Interest credited | (24) | (20)
Not Designated as Hedging Instrument | Interest Rate Future |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 0 | 1
Not Designated as Hedging Instrument | Total Return Swap |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (6) | 4
Not Designated as Hedging Instrument | Interest Rate Swaption |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 0 | (3)
Not Designated as Hedging Instrument | Foreign Exchange Option |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | $ (1) | $ 0

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- Definition This item represents the amount recognized in investment related gains (losses) related to the change in the fair value of derivatives, excluding embedded derivatives. + References No definition available. + Details
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