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Investments - Net Investment Income (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 203,000,000 | $ 224,000,000 | $ 550,000,000 | $ 654,000,000
Investment expenses | (8,000,000) | (10,000,000) | (25,000,000) | (28,000,000)
Net investment income (excluding net realized capital gains or losses) | 195,000,000 | 214,000,000 | 525,000,000 | 626,000,000
Net realized capital gains | 9,000,000 | 49,000,000 | 25,000,000 | 179,000,000
Net investment income | 204,000,000 | 263,000,000 | 550,000,000 | 805,000,000
Credit-related impairment loss (reversal of loss) | 1,000,000 |  | 4,000,000 |
Yield-related impairment loss | 2,000,000 |  | 44,000,000 |
Other-than-temporary impairment loss |  | 9,000,000 |  | 22,000,000
Supporting experience-rated products |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Net investment income | 10,000,000 | 10,000,000 | 31,000,000 | 33,000,000
Debt securities |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 151,000,000 | 145,000,000 | 441,000,000 | 437,000,000
Mortgage loans |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 15,000,000 | 19,000,000 | 45,000,000 | 54,000,000
Other investments |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 37,000,000 | $ 60,000,000 | $ 64,000,000 | $ 163,000,000

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