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Fidelis Care Acquisition (Details) - USD ($) shares in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2018 | May 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Department Of Health, State Of New York |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Commitment to undertaking | $ 340 |  | $ 328 |
Commitment to undertaking, term | 5 years |  |  |
Public Stock Offering |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Shares issued to fund acquisition (in shares) |  | 53 |  |
Fidelis Care |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition consideration | $ 3,604 |  |  |
Revenue of acquiree since acquisition date, actual |  |  | 5,628 |
Total revenues |  |  | $ 65,792 | $ 58,275

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