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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |
Premium deficiency reserve | $ 22 |  | $ 30
Amounts due government agencies | 1,575 |  | 1,202
Total revenue | 4,904 | $ 4,343 |
Retained earnings | 887 |  | 810
Adjustment | Accounting Standards Update 2014-09 |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |
Retained earnings | 50 |  |
Florida | Adjustment |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |
Total revenue |  | $ 18 |
Medicaid Expansion |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |
Amounts due government agencies | 245 |  | 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 | $ 262 |  | $ 272

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