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Investments (Exposure To Concentrations Of Credit Risk) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | $ 104,461 |  | $ 82,907 |
Fixed maturity securities, available-for-sale | 99,573 | [1] | 77,617 | [2]
JAPAN |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 6,806 |  | 5,319 |
Fixed maturity securities, available-for-sale | 5,162 |  | 4,445 |
US Treasury and Government [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 4,032 |  | 2,734 |
Fixed maturity securities, available-for-sale | 3,814 | [1] | 2,464 | [2]
Canadian Province Of Quebec Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,657 |  | 1,537 |
Fixed maturity securities, available-for-sale | 1,825 |  | 1,741 |
Canadian Province Of Ontario Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,099 |  | 1,117 |
Fixed maturity securities, available-for-sale | 1,179 |  | 1,207 |
Korean Government |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,390 |  | 802 |
Fixed maturity securities, available-for-sale | $ 1,385 |  | $ 813 |
[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, 2025, the fair value of such investments was $940 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, 2024, the fair value of such investments was $966 million

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