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Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |  |
Medical cost floors and corridors |  | $ 95 |  |  | $ 103 |
Amounts due government agencies |  | 612 |  |  | 967 |
Risk adjustment payable |  | 285 |  |  | 466 |
Risk adjustment receivable |  | 76 |  |  | 34 |
Risk adjustment, net payable |  | $ 209 |  |  | 432 |
Maturity period |  | 10 years |  |  |  |
Adoption of new accounting standard |  |  |  | $ 85 |  | $ 6
Receivables from state and federal government agencies |  | $ 1,280 |  |  | 1,330 |
Retained Earnings |  |  |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |  |
Adoption of new accounting standard |  |  |  | 85 |  | $ 7
Retained Earnings | Accounting Standards Update 2016-02 |  |  |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |  |
Adoption of new accounting standard |  |  |  | $ 85 |  |
CMS Subsidies |  |  |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |  |
Reimbursement | $ 5 |  | $ 81 |  |  |
State and Federal Government Agencies | Accounts Receivable | Customer Concentration Risk |  |  |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |  |
Concentration risk, percentage |  | 70.00% |  |  |  |
Receivables from state and federal government agencies |  | $ 970 |  |  |  |
Medicaid Expansion |  |  |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |  |  |
Amounts due government agencies |  | $ 78 |  |  | $ 87 |

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