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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |
Amounts due government agencies | $ 1,844 | $ 1,202
Premium deficiency reserve | 100 | 30
Retained earnings | 657 | 810
Adjustment | Accounting Standards Update 2014-09 |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |
Retained earnings | 50 |
Medicaid Expansion |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |
Amounts due government agencies | 114 | 244
Medical Premium Liability Due to Agency |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |
Medical premiums liability based on medical cost thresholds | $ 136 | $ 272

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