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Investments (Exposure To Concentrations Of Credit Risk) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | $ 57,849 | $ 55,873
Fixed maturity securities, available-for-sale | 57,922 | 60,749
Government Of Japan [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | 3,887 | 3,080
Fixed maturity securities, available-for-sale | 3,742 | 3,063
Canadian Province Of Quebec Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | 1,409 | 1,377
Fixed maturity securities, available-for-sale | 2,062 | 2,347
Canadian Province Of Ontario Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale at Fair value - Amortized cost | 1,063 | 1,092
Fixed maturity securities, available-for-sale | $ 1,288 | $ 1,451

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