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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |
Service revenue relating to unsatisfied performance obligations | $ 571 |  |
Amounts due government agencies | 1,714 | $ 1,542 |
Risk adjustment receivable (payable) | 1,129 | 912 |
Restricted cash and cash equivalents | 95 |  | $ 95
Medicaid Expansion |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |
Amounts due government agencies | 97 | 96 |
Medical Premium Liability Due to Agency |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |
Medical premiums liability based on medical cost thresholds | 148 | $ 135 |
CMS Subsidies |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |
Operating expense | $ 70 |  |

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