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Investments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investments | $ 18,254 |  |
Debt securities available for sale, current | 2,359 |  |
Long-term investments | 15,732 | $ 112 |
Restricted investments | 531 |  |
Net investment income | $ 660 | 21 | $ 20
Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investments |  |  | 111
Residential mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
AFS weighted average duration of securities | 4 years 9 months 18 days |  |
Commercial mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
AFS weighted average duration of securities | 6 years 3 months 18 days |  |
Other asset-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
AFS weighted average duration of securities | 1 year 3 months 18 days |  |
Debt securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Net investment income |  | $ 21 | $ 20

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