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Investments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |
Investments related to 2012 contract conversion | $ 524 | $ 537
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Weighted average duration of securities | 2 years 4 months 24 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 1 month 6 days |

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