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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 496 | $ 383 | $ 980 | $ 832
Investment expenses | (12) | (11) | (24) | (21)
Net investment income (excluding net realized capital losses) | 484 | 372 | 956 | 811
Net realized capital losses | (90) | (98) | (108) | (203)
Net investment income | 394 | 274 | 848 | 608
Yield-related impairment losses | 28 | 37 | 38 | 61
Credit-related impairment losses (reversal of losses) | 0 | (2) | 0 | (3)
Supporting experience-rated products |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Net investment income | 8 | 9 | 16 | 17
Debt securities |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 265 | 204 | 509 | 395
Mortgage loans |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 19 | 14 | 36 | 27
Other investments |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 212 | $ 165 | $ 435 | $ 410

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