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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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