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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | $ 553 | $ 484
Investment expenses | (12) | (12)
Net investment income (excluding net realized losses) | 541 | 472
Net realized capital losses | (21) | (18)
Net investment income | 520 | 454
Debt securities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 323 | 244
Mortgage loans |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 21 | 17
Other investments |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | $ 209 | $ 223

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