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Investments - Net Investment Income (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | $ 781,000,000 | $ 854,000,000 | $ 660,000,000
Investment expenses | (35,000,000) | (42,000,000) | (3,000,000)
Net investment income (excluding net realized capital gains or losses) | 746,000,000 | 812,000,000 | 657,000,000
Net realized capital gains | 52,000,000 | 199,000,000 | 3,000,000
Net investment income | 798,000,000 | 1,011,000,000 | 660,000,000
Credit-related impairment loss (reversal of loss) | 0 |  |
Yield-related impairment loss | (49,000,000) |  |
OTTI losses, investments, portion recognized in earnings, net |  | (24,000,000) | 0
Supporting experience- rated products |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Net investment income | 42,000,000 | 44,000,000 | 4,000,000
Debt securities |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | 598,000,000 | 589,000,000 | 61,000,000
Mortgage loans |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | 60,000,000 | 71,000,000 | 6,000,000
Other investments |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | $ 123,000,000 | $ 194,000,000 | $ 593,000,000

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