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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | $ 1,696 | $ 1,201 | $ 1,070
Investment expenses | (46) | (43) | (47)
Net investment income (excluding net realized capital gains or losses) | 1,650 | 1,158 | 1,023
Net realized capital gains (losses) | (497) | (320) | 176
Net investment income | 1,153 | 838 | 1,199
Yield-related impairment loss | 152 | 143 | 42
Credit-related impairment loss (reversal of loss) | (3) | 13 | 0
Supporting experience- rated products |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Net investment income | 34 | 35 | 38
Debt securities |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | 841 | 702 | 634
Mortgage loans |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | 59 | 51 | 55
Other investments |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | $ 796 | $ 448 | $ 381

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