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Investments (Exposure To Concentrations Of Credit Risk) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | $ 59,663 |  | $ 55,873 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | 52,901 | [1] | 60,749 | [2]
JAPAN |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 2,988 |  | 3,080 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | 2,516 |  | 3,063 |
Canadian Province Of Ontario Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,436 |  | 1,377 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | 1,649 |  | 2,347 |
Canadian Province Of Quebec Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 982 |  | 1,092 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | $ 1,068 |  | $ 1,451 |
[1] | Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2022, the fair value of such investments was $683 million
[2] | Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2021, the fair value of such investments was $581 million.

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