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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 659 | $ 557 | $ 1,737 | $ 1,537
Investment expenses | (16) | (26) | (39) | (50)
Net investment income (excluding net realized capital gains or losses) | 643 | 531 | 1,698 | 1,487
Net realized capital gains (losses) | (11) | 19 | (59) | (89)
Net investment income | 632 | 550 | 1,639 | 1,398
Debt securities |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 339 | 307 | 986 | 816
Mortgage loans |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 22 | 20 | 64 | 56
Other investments |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 298 | $ 230 | $ 687 | $ 665

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