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Significant Accounting Policies - Schedule of Premium Revenue (Details) - Health Plans - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 18,299 | $ 16,208 | $ 17,612
Premium revenue percentage | 100.00% | 100.00% | 100.00%
California |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 2,109 | $ 2,266 | $ 2,150
Premium revenue percentage | 11.50% | 14.00% | 12.20%
Florida |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 643 | $ 734 | $ 1,790
Premium revenue percentage | 3.50% | 4.50% | 10.20%
Illinois |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 1,328 | $ 1,002 | $ 793
Premium revenue percentage | 7.30% | 6.20% | 4.50%
Kentucky |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 654 | $ 0 | $ 0
Premium revenue percentage | 3.60% | 0.00% | 0.00%
Michigan |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 1,587 | $ 1,624 | $ 1,601
Premium revenue percentage | 8.70% | 10.00% | 9.10%
Ohio |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 2,962 | $ 2,553 | $ 2,388
Premium revenue percentage | 16.20% | 15.80% | 13.60%
Texas |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 3,085 | $ 2,991 | $ 3,244
Premium revenue percentage | 16.90% | 18.50% | 18.40%
Washington |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 3,169 | $ 2,695 | $ 2,361
Premium revenue percentage | 17.30% | 16.60% | 13.40%
Other |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 2,762 | $ 2,343 | $ 3,285
Premium revenue percentage | 15.00% | 14.40% | 18.60%

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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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