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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, 2020 | Mar. 31, 2019
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | $ (285) | $ 8
Policy acquisition costs and other insurance expenses | (248) | (312)
Interest credited | (146) | (133)
Other revenues | 76 | 94
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives | 123 | (11)
Not Designated as Hedging Instrument |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (229) | 8
Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 106 | 24
Not Designated as Hedging Instrument | Financial Futures |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 44 | (22)
Not Designated as Hedging Instrument | Currency Swap [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (13) | 1
Not Designated as Hedging Instrument | Foreign Currency Forwards |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (3) | 0
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (40) | (9)
Not Designated as Hedging Instrument | Credit Default Swaps |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | (24) | 15
Not Designated as Hedging Instrument | Equity Options |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Total investment related gains (losses), net | 53 | (23)
Not Designated as Hedging Instrument | Longevity Swap [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Other revenues | 0 | 2
Not Designated as Hedging Instrument | Mortality Swap [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Other revenues | 0 | 1
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 | (230) | (2)
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member] |  |
Income Affect Of Non Hedging Derivatives [Line Items] |  |
Interest credited | (6) | (3)
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 | $ (128) | $ 18

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