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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 279 | $ 203 | $ 822 | $ 550
Investment expenses | (11) | (8) | (28) | (25)
Net investment income (excluding net realized capital gains or losses) | 268 | 195 | 794 | 525
Net realized capital gains (losses) | (22) | 9 | 38 | 25
Net investment income | 246 | 204 | 832 | 550
Yield-related impairment loss | 3 | 2 | 35 | 44
Credit-related impairment loss | 0 | 1 | 0 | 4
Supporting experience-rated products |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Net investment income | 9 | 10 | 28 | 31
Debt securities |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 157 | 151 | 474 | 441
Mortgage loans |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 13 | 15 | 41 | 45
Other investments |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 109 | $ 37 | $ 307 | $ 64

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