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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, 2022 | Mar. 31, 2021
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | $ (126) | $ 302
Interest credited | (141) | (146)
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives | (90) | (51)
Not Designated as Hedging Instrument |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (73) | 32
Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (52) | (70)
Not Designated as Hedging Instrument | Financial Futures |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 7 | (10)
Not Designated as Hedging Instrument | Currency Swap [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 7 | 9
Not Designated as Hedging Instrument | Foreign Currency Forwards |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (23) | (8)
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 29 | 18
Not Designated as Hedging Instrument | Credit Default Swaps |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (58) | 20
Not Designated as Hedging Instrument | Equity Options |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 0 | (10)
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 | (33) | 50
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Interest credited | (36) | (14)
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | $ 14 | $ 19

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