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v3.19.1

Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Jan. 01, 2018
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Medical cost floors and corridors | $ 98 |  | $ 103 |
Amounts due government agencies | 932 |  | 967 |
Risk adjustment payable | 568 |  | 466 |
Risk adjustment receivable | $ 51 |  | 34 |
Maturity period | 10 years |  |  |
Restricted cash and cash equivalents | $ 74 | $ 95 |  |
Medicaid Expansion |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Amounts due government agencies | $ 87 |  | $ 87 |
CMS Subsidies |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Operating expense |  | $ 70 |  |
ASU 2014-09 |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Adoption of ASU |  |  |  | $ 6
ASU 2014-09 | Retained Earnings |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Adoption of ASU |  |  |  | $ 7

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