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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 432 | $ 322 | $ 1,264 | $ 827
Investment expenses | (13) | (11) | (34) | (29)
Net investment income (excluding net realized capital losses) | 419 | 311 | 1,230 | 798
Net realized capital losses | (142) | (110) | (345) | (283)
Net investment income | 277 | 201 | 885 | 515
Yield-related impairment loss | 47 | 73 | 108 | 121
Credit-related impairment loss (reversal of loss) | 0 | 1 | (3) | 17
Supporting experience-rated products |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Net investment income | 8 | 8 | 25 | 26
Debt securities |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 217 | 174 | 612 | 510
Mortgage loans |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 16 | 14 | 43 | 38
Other investments |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 199 | $ 134 | $ 609 | $ 279

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