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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Amounts due government agencies | $ 1,030 | $ 1,030 | $ 1,542 |
Risk adjustment receivable (payable) | 390 | $ 390 | 912 |
Additional medical care costs incurred | 5 |  |  |
Maturity period |  | 10 years |  |
Average maturity period |  | 3 years |  |
Adjustments to provisional valuation of deferred tax assets and liabilities | 4 |  |  |
Restricted cash and cash equivalents | 94 | $ 94 |  | $ 91
Medicaid Expansion |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Amounts due government agencies | 144 | 144 | 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 | $ 198 | 198 | $ 135 |
CMS Subsidies |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Operating expense |  | $ 81 |  |

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