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v3.19.3.a.u2

Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Jan. 01, 2018
Property, Plant and Equipment [Line Items] |  |  |  |  |
Final maturities of investments | 10 years |  |  |  |
Average maturity of investments | 10 years |  |  |  |
Medical premium liability based on medical costs threshold | $ 74 | $ 103 |  |  |
Amounts due government agencies | 664 | 967 |  |  |
Risk adjustment payable | 368 | 466 |  |  |
Risk adjustment receivable | 63 | 34 |  |  |
Risk adjustment, net payable | 305 | 432 |  |  |
Prepaid reinsurance premiums | 17 | 16 | $ 20 |  |
Reinsurance recoveries | 18 | 33 | 24 |  |
Reinsurance recoverable for unpaid claims adjustments | 21 | 31 | $ 16 |  |
Adoption of new accounting standard |  |  |  | $ 85 | $ 6
Receivables from state and federal government agencies | 1,406 | 1,330 |  |  |
Retained Earnings |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Adoption of new accounting standard |  |  |  | 85 |
Retained Earnings, Including Deferred Income Tax |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Adoption of new accounting standard |  |  |  | 110 |
Deferred Income Tax |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Adoption of new accounting standard |  |  |  | $ 25 |
CMS Subsidies |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Disposal group, operating expense |  | 81 |  |  |
Medicaid Expansion |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Amounts due government agencies | $ 69 | 87 |  |  |
Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Useful life | 5 years |  |  |  |
Minimum | California, Illinois, New Mexico, Ohio, South Carolina, Texas, Washington, and Wisconsin |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Percentage of additional incremental revenue earned | 1.00% |  |  |  |
Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Useful life | 15 years |  |  |  |
Maximum | California, Illinois, New Mexico, Ohio, South Carolina, Texas, Washington, and Wisconsin |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Percentage of additional incremental revenue earned | 4.00% |  |  |  |
Structured Securities |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Average maturity of investments | 10 years |  |  |  |
Government receivables |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Concentration risk, percentage | 75.00% |  |  |  |
Receivables from state and federal government agencies | $ 1,056 | $ 872 |  |  |

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