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Investments - Investment Income (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | $ 206,000,000 | $ 199,000,000
Investment expenses | (8,000,000) | (9,000,000)
Net investment income (excluding net realized capital gains or losses) | 198,000,000 | 190,000,000
Net realized capital gains (losses) | (36,000,000) | 59,000,000
Net investment income | 162,000,000 | 249,000,000
Credit-related impairment loss | 45,000,000 |
Yield-related impairment loss | 41,000,000 |
Other-than-temporary impairment loss |  | 7,000,000
Supporting experience-rated products |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Net investment income | 11,000,000 | 11,000,000
Debt securities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 144,000,000 | 156,000,000
Mortgage loans |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 15,000,000 | 17,000,000
Other investments |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | $ 47,000,000 | $ 26,000,000

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