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Significant Accounting Policies - Schedule of Premium Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 16,208 | $ 17,612 | $ 18,854
Texas |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | 2,062 |  |
Health Plans |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 16,208 | $ 17,612 | $ 18,854
Premium revenue percentage | 100.00% | 100.00% | 100.00%
Health Plans | California |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 2,266 | $ 2,150 | $ 2,701
Premium revenue percentage | 14.00% | 12.20% | 14.30%
Health Plans | Florida |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 734 | $ 1,790 | $ 2,568
Premium revenue percentage | 4.50% | 10.20% | 13.60%
Health Plans | Illinois |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 1,002 | $ 793 | $ 593
Premium revenue percentage | 6.20% | 4.50% | 3.10%
Health Plans | Michigan |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 1,624 | $ 1,601 | $ 1,596
Premium revenue percentage | 10.00% | 9.10% | 8.50%
Health Plans | New Mexico |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 0 | $ 1,356 | $ 1,368
Premium revenue percentage | 0.00% | 7.70% | 7.30%
Health Plans | Ohio |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 2,553 | $ 2,388 | $ 2,216
Premium revenue percentage | 15.80% | 13.60% | 11.80%
Health Plans | Puerto Rico |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 474 | $ 696 | $ 732
Premium revenue percentage | 2.90% | 3.90% | 3.90%
Health Plans | South Carolina |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 583 | $ 495 | $ 445
Premium revenue percentage | 3.60% | 2.80% | 2.40%
Health Plans | Texas |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 2,991 | $ 3,244 | $ 2,813
Premium revenue percentage | 18.50% | 18.40% | 14.90%
Health Plans | Washington |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 2,695 | $ 2,361 | $ 2,608
Premium revenue percentage | 16.60% | 13.40% | 13.80%
Health Plans | Other |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 1,286 | $ 738 | $ 1,214
Premium revenue percentage | 7.90% | 4.20% | 6.40%

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