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Investments (Exposure To Concentrations Of Credit Risk) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | $ 62,332 |  | $ 59,663 |
Fixed maturity securities, available-for-sale | 54,171 | [1] | 52,901 | [2]
Canadian Province Of Quebec Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,415 |  | 1,436 |
Fixed maturity securities, available-for-sale | 1,465 |  | 1,649 |
Canadian Province Of Ontario Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,001 |  | 982 |
Fixed maturity securities, available-for-sale | $ 1,014 |  | $ 1,068 |
[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 September 30, 2023, the fair value of such investments was $818 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, 2022, the fair value of such investments was $683 million

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