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Investments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items] |  |  |
Investments related to 2012 contract conversion | $ 537 | $ 531 |
Net investment income | $ 1,011 | $ 660 | $ 21
Residential mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Weighted average duration of securities | 3 years 3 months 18 days |  |
Commercial mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Weighted average duration of securities | 6 years 1 month 6 days |  |
Other asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Weighted average duration of securities | 1 year 2 months 12 days |  |

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