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Investments - Investment Income (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |
Gross investment income | $ 660
Investment expenses | (3)
Net investment income (excluding net realized capital gains or losses) | 657
Net realized capital gains | 3
Net Investment Income | 660
Debt securities |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |
Gross investment income | 637
Mortgage loans |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |
Gross investment income | 6
Other investments |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |
Gross investment income | 17
Supporting experience-rated products |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |
Net Investment Income | $ 4

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