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Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | 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 | $ 1,202 |  |  |  | $ 729 |  |  |  | $ 1,202 | $ 729 |  | $ 729
Premium revenue | 4,177 | $ 4,191 | $ 4,029 | $ 3,995 | 3,589 | $ 3,377 | $ 3,304 | $ 2,971 | 16,392 | 13,241 | $ 9,023 |
Accounts payable | 385 |  |  |  | 362 |  |  |  | 385 | 362 |  | 362
Revenues |  |  |  |  |  |  |  |  | 17,782 | 14,178 | 9,667 |
Risk transfer payment above estimate |  |  |  |  |  |  |  |  | 40 |  |  |
Unrecorded receivable for Marketplace risk corridor | 142 |  |  |  |  |  |  |  | 142 |  |  |
Unrecorded receivable for Marketplace risk corridor, prior year | 52 |  |  |  |  |  |  |  | 52 |  |  |
Unrecorded receivable for Marketplace risk corridor, current year | 90 |  |  |  |  |  |  |  | 90 |  |  |
Medical administrative costs |  |  |  |  |  |  |  |  | 488 | 398 | 263 |
Premium deficiency recorded | 30 |  |  |  |  |  |  |  | 30 |  |  |
Health Plans |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | 16,392 | 13,241 | 9,023 |
Revenues |  |  |  |  |  |  |  |  | 17,234 | 13,917 | 9,449 |
Medicaid Expansion |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amounts due government agencies | 244 |  |  |  | 208 |  |  |  | 244 | 208 |  | 208
Florida | Health Plans |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | 1,926 | 1,199 | 439 |
New Mexico | Health Plans |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | 1,304 | 1,237 | 1,076 |
Texas | Health Plans |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | 2,454 | 1,961 | $ 1,318 |
Texas | Quality Incentives |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue recognized during period |  |  | $ 51 |  |  |  |  |  |  |  |  |
Deferred revenue for services provided |  |  |  |  |  |  |  |  |  |  |  | 44
California Department of Healthcare Services |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | 68 |  |  |
California Department of Healthcare Services | Claims for services prior to 2016 |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | 35 |  |  |
New Mexico Human Services Department |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 145 |  |  |  |  |  |  |  | 145 |  |  |
Adjustment to Previously Recognized Revenue | Florida |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  | $ 18 |  |  |  |  |  |  |  |
Adjustment to Previously Recognized Revenue | New Mexico Human Services Department |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | (45) |  |  |
Adjustment to Previously Recognized Revenue | New Mexico Human Services Department | Claims for services prior to 2016 |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | (29) |  |  |
Medical Premium Liability Due to Agency |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Medical premium liability based on medical costs threshold | $ 272 |  |  |  | $ 214 |  |  |  | $ 272 | $ 214 |  | $ 214
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] |  |  |  |  |  |  |  |  |  |  |  |
Final maturities of investments |  |  |  |  |  |  |  |  | 10 years |  |  |
Average maturity of investments |  |  |  |  |  |  |  |  | 3 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 |  |  |  |  |  |  |  |  | 3.00% |  |  |

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