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Investments - Investment Income (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 231,000,000 | $ 214,000,000 | $ 430,000,000 | $ 264,000,000
Investment expenses | (9,000,000) | 0 | (18,000,000) | 0
Net investment income (excluding net realized capital gains or losses) | 222,000,000 | 214,000,000 | 412,000,000 | 264,000,000
Net realized capital gains | 71,000,000 | 0 | 130,000,000 | 0
Net investment income | 293,000,000 | 214,000,000 | 542,000,000 | 264,000,000
OTTI losses, investments, portion recognized in earnings, net | 6,000,000 | 0 | 13,000,000 | 0
Supporting experience-rated products |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Net investment income | 12,000,000 | 0 | 23,000,000 | 0
Debt securities |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 146,000,000 | 1,000,000 | 292,000,000 | 3,000,000
Mortgage loans |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | 18,000,000 | 0 | 35,000,000 | 0
Other investments |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Gross investment income | $ 67,000,000 | $ 213,000,000 | $ 103,000,000 | $ 261,000,000

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