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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 557 | $ 432 | $ 1,537 | $ 1,264
Investment expenses | (26) | (13) | (50) | (34)
Net investment income (excluding net realized capital gains or losses) | 531 | 419 | 1,487 | 1,230
Net realized capital gains (losses) | 19 | (142) | (89) | (345)
Net investment income | 550 | 277 | 1,398 | 885
Yield-related impairment losses | 12 | 47 | 51 | 108
Credit-related impairment losses (reversal of losses) | 0 | 0 | 0 | (3)
Supporting experience-rated products |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Net investment income | 8 | 8 | 24 | 25
Debt securities |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 307 | 217 | 816 | 612
Mortgage loans |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 20 | 16 | 56 | 43
Other investments |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 230 | $ 199 | $ 665 | $ 609

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