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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | $ 1,201 | $ 1,070 | $ 781
Investment expenses | (43) | (47) | (35)
Net investment income (excluding net realized capital gains or losses) | 1,158 | 1,023 | 746
Net realized capital gains (losses) | (320) | 176 | 52
Net investment income | 838 | 1,199 | 798
Credit-related impairment loss | 13 | 0 | 0
Yield-related impairment loss | 143 | 42 | 49
Supporting experience- rated products |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Net investment income | 35 | 38 | 42
Debt securities |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | 702 | 634 | 598
Mortgage loans |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | 51 | 55 | 60
Other investments |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | $ 448 | $ 381 | $ 123

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