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Significant Accounting Policies - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Final maturities of investments |  |  |  |  |  |  |  |  | 10 years |  |
Average maturity of investments |  |  |  |  |  |  |  |  | 3 years |  |
Amounts due government agencies | $ 1,542,000,000 |  |  |  | $ 1,202,000,000 |  |  |  | $ 1,542,000,000 | $ 1,202,000,000 |
Premium revenue |  |  |  |  |  |  |  |  | 18,854,000,000 | 16,445,000,000 | $ 13,261,000,000
Accounts payable | 366,000,000 |  |  |  | 385,000,000 |  |  |  | 366,000,000 | 385,000,000 |
Revenues | 4,949,000,000 | $ 5,031,000,000 | $ 4,999,000,000 | $ 4,904,000,000 | 4,534,000,000 | $ 4,546,000,000 | $ 4,359,000,000 | $ 4,343,000,000 | 19,883,000,000 | 17,782,000,000 | 14,178,000,000
Risk corridor payments not yet recorded | 128,000,000 |  |  |  |  |  |  |  | 128,000,000 |  |
Medical administrative costs |  |  |  |  |  |  |  |  | 554,000,000 | 488,000,000 | 398,000,000
Premium deficiency recorded | 0 |  |  |  | 30,000,000 |  |  |  | 0 | 30,000,000 |
Additional medical care costs incurred, due to federal government ceasing payments | 73,000,000 |  |  |  |  |  |  |  |  |  |
Health Plans |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | 18,854,000,000 | 16,445,000,000 | 13,261,000,000
Revenues |  |  |  |  |  |  |  |  | 19,352,000,000 | 17,234,000,000 | 13,917,000,000
Medicaid Expansion |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amounts due government agencies | 96,000,000 |  |  |  | 244,000,000 |  |  |  | 96,000,000 | 244,000,000 |
Florida | Health Plans |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | 2,568,000,000 | 1,938,000,000 | 1,199,000,000
New Mexico | Health Plans |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | 1,368,000,000 | 1,305,000,000 | 1,237,000,000
Texas | Health Plans |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | 2,813,000,000 | 2,461,000,000 | $ 1,963,000,000
Medical Premium Liability Due to Agency |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Medical premium liability based on medical costs threshold | $ 135,000,000 |  |  |  | $ 272,000,000 |  |  |  | $ 135,000,000 | $ 272,000,000 |
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 | California, Illinois, New Mexico, Ohio, South Carolina, Texas, Washington, and Wisconsin |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of additional incremental revenue earned |  |  |  |  |  |  |  |  | 3.00% |  |

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