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Significant Accounting Policies - Schedule of Premium Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 12 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
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue | $ 4,177 | $ 4,191 | $ 4,029 | $ 3,995 | $ 3,589 | $ 3,377 | $ 3,304 | $ 2,971 | $ 16,392 | $ 13,241 | $ 9,023
Health Plans |  |  |  |  |  |  |  |  |  |  |
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | $ 16,392 | $ 13,241 | $ 9,023
Premium revenue percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Health Plans | California |  |  |  |  |  |  |  |  |  |  |
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | $ 2,370 | $ 2,200 | $ 1,523
Premium revenue percentage |  |  |  |  |  |  |  |  | 14.50% | 16.60% | 16.90%
Health Plans | Florida |  |  |  |  |  |  |  |  |  |  |
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | $ 1,926 | $ 1,199 | $ 439
Premium revenue percentage |  |  |  |  |  |  |  |  | 11.70% | 9.00% | 4.90%
Health Plans | Illinois |  |  |  |  |  |  |  |  |  |  |
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | $ 601 | $ 397 | $ 153
Premium revenue percentage |  |  |  |  |  |  |  |  | 3.70% | 3.00% | 1.70%
Health Plans | Michigan |  |  |  |  |  |  |  |  |  |  |
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | $ 1,520 | $ 1,067 | $ 781
Premium revenue percentage |  |  |  |  |  |  |  |  | 9.30% | 8.10% | 8.70%
Health Plans | New Mexico |  |  |  |  |  |  |  |  |  |  |
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | $ 1,304 | $ 1,237 | $ 1,076
Premium revenue percentage |  |  |  |  |  |  |  |  | 7.90% | 9.30% | 11.90%
Health Plans | New York |  |  |  |  |  |  |  |  |  |  |
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | $ 82 | $ 0 | $ 0
Premium revenue percentage |  |  |  |  |  |  |  |  | 0.50% | 0.00% | 0.00%
Health Plans | Ohio |  |  |  |  |  |  |  |  |  |  |
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | $ 1,961 | $ 2,034 | $ 1,553
Premium revenue percentage |  |  |  |  |  |  |  |  | 12.00% | 15.40% | 17.20%
Health Plans | Puerto Rico |  |  |  |  |  |  |  |  |  |  |
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | $ 726 | $ 567 | $ 0
Premium revenue percentage |  |  |  |  |  |  |  |  | 4.40% | 4.30% | 0.00%
Health Plans | South Carolina |  |  |  |  |  |  |  |  |  |  |
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | $ 378 | $ 348 | $ 381
Premium revenue percentage |  |  |  |  |  |  |  |  | 2.30% | 2.60% | 4.20%
Health Plans | Texas |  |  |  |  |  |  |  |  |  |  |
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | $ 2,454 | $ 1,961 | $ 1,318
Premium revenue percentage |  |  |  |  |  |  |  |  | 15.00% | 14.80% | 14.60%
Health Plans | Utah |  |  |  |  |  |  |  |  |  |  |
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | $ 444 | $ 331 | $ 310
Premium revenue percentage |  |  |  |  |  |  |  |  | 2.70% | 2.50% | 3.40%
Health Plans | Washington |  |  |  |  |  |  |  |  |  |  |
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | $ 2,218 | $ 1,602 | $ 1,305
Premium revenue percentage |  |  |  |  |  |  |  |  | 13.50% | 12.10% | 14.50%
Health Plans | Wisconsin |  |  |  |  |  |  |  |  |  |  |
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | $ 395 | $ 261 | $ 156
Premium revenue percentage |  |  |  |  |  |  |  |  | 2.40% | 2.00% | 1.70%
Health Plans | Direct delivery and other |  |  |  |  |  |  |  |  |  |  |
Summarized premium revenue |  |  |  |  |  |  |  |  |  |  |
Premium revenue |  |  |  |  |  |  |  |  | $ 13 | $ 37 | $ 28
Premium revenue percentage |  |  |  |  |  |  |  |  | 0.10% | 0.30% | 0.30%

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