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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, 2021 | Mar. 31, 2020
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | $ 302 | $ (285)
Policy acquisition costs and other insurance expenses | (333) | (248)
Interest credited | (146) | (146)
Other revenues | 91 | 76
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives | (51) | 123
Not Designated as Hedging Instrument |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 32 | (229)
Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (70) | 106
Not Designated as Hedging Instrument | Financial Futures |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (10) | 44
Not Designated as Hedging Instrument | Currency Swap [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 9 | (13)
Not Designated as Hedging Instrument | Foreign Currency Forwards |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (8) | (3)
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 18 | (40)
Not Designated as Hedging Instrument | Credit Default Swaps |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 20 | (24)
Not Designated as Hedging Instrument | Equity Options |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (10) | 53
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 | 50 | (230)
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Interest credited | (14) | (6)
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 | $ 19 | $ (128)

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