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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 525 | $ 496 | $ 1,078 | $ 980
Investment expenses | (11) | (12) | (23) | (24)
Net investment income (excluding net realized losses) | 514 | 484 | 1,055 | 956
Net realized capital losses | (27) | (90) | (48) | (108)
Net investment income | 487 | 394 | 1,007 | 848
Debt securities |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 324 | 265 | 647 | 509
Mortgage loans |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 21 | 19 | 42 | 36
Other investments |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 180 | $ 212 | $ 389 | $ 435

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