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Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |
Maturity period | 10 years |
Average maturity period | 10 years |
Interest receivable | $ 11 | $ 12
Medical cost floors and corridors | 74 | 74
Amounts due government agencies | 777 | 664
Risk adjustment payable | 456 | 368
Risk adjustment receivable | 76 | 63
Risk adjustment, net payable | 380 | 305
Risk adjustment, net payable, current year | 80 |
Risk adjustment, net payable, prior year | 300 |
Receivables from state and federal government agencies | 1,603 | 1,406
HIF liabilities | 271 |
Medicaid Expansion |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |
Amounts due government agencies | $ 69 | $ 69

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