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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | $ 854 | $ 660
Investment expenses | (42) | (3)
Net investment income (excluding net realized capital gains or losses) | 812 | 657
Net realized capital gains | 199 | 3
Net investment income | 1,011 | 660
OTTI losses, investments, portion recognized in earnings, net | (24) |
Supporting experience-rated products |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Net investment income | 44 | 4
Debt securities |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 589 | 61
Mortgage loans |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | 71 | 6
Other investments |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gross investment income | $ 194 | $ 593

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