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Investments - Net Investment Income (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 141,000,000 | $ 231,000,000 | $ 347,000,000 | $ 430,000,000
Investment expenses | (9,000,000) | (9,000,000) | (17,000,000) | (18,000,000)
Net investment income (excluding net realized capital gains or losses) | 132,000,000 | 222,000,000 | 330,000,000 | 412,000,000
Net realized capital gains | 52,000,000 | 71,000,000 | 16,000,000 | 130,000,000
Net investment income | 184,000,000 | 293,000,000 | 346,000,000 | 542,000,000
Credit-related impairment loss (reversal of loss) | (42,000,000) |  | 3,000,000 |
Yield-related impairment loss | 1,000,000 |  | 42,000,000 |
Other-than-temporary impairment loss |  | 6,000,000 |  | 13,000,000
Supporting experience-rated products |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Net investment income | 10,000,000 | 12,000,000 | 21,000,000 | 23,000,000
Debt securities |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 146,000,000 | 146,000,000 | 290,000,000 | 292,000,000
Mortgage loans |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 15,000,000 | 18,000,000 | 30,000,000 | 35,000,000
Other investments |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ (20,000,000) | $ 67,000,000 | $ 27,000,000 | $ 103,000,000

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