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Investments (Exposure To Concentrations Of Credit Risk) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | $ 81,606 |  | $ 64,977 |
Fixed maturity securities, available-for-sale | 78,149 | [1] | 60,467 | [2]
JAPAN |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 6,103 |  | 3,630 |
Fixed maturity securities, available-for-sale | 5,270 |  | 3,131 |
US Treasury and Government [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,897 |  | 2,725 |
Fixed maturity securities, available-for-sale | 1,703 | [1] | 2,520 | [2]
Canadian Province Of Quebec Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,591 |  | 1,467 |
Fixed maturity securities, available-for-sale | 1,843 |  | 1,748 |
Canadian Province Of Ontario Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,180 |  | 1,019 |
Fixed maturity securities, available-for-sale | $ 1,291 |  | $ 1,125 |
[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, 2024, the fair value of such investments was $921 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, 2023, the fair value of such investments was $856 million

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