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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | $ 252 | $ 258
Investment expenses | (9) | (8)
Net investment income (excluding net realized capital gains or losses) | 243 | 250
Net realized capital gains (losses) | (75) | 47
Net investment income | 168 | 297
Yield-related impairment loss | 18 | 30
Credit-related impairment loss | 38 | 0
Supporting experience-rated products |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Net investment income | 9 | 9
Debt securities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 164 | 157
Mortgage loans |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 11 | 15
Other investments |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | $ 77 | $ 86

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