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Significant Accounting Policies - Schedule of Premium Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 26,855 | $ 18,299 | $ 16,208
Health Plans |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 26,855 | $ 18,299 | $ 16,208
Premium revenue percentage | 100.00% | 100.00% | 100.00%
Health Plans | California |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 2,402 | $ 2,109 | $ 2,266
Premium revenue percentage | 8.90% | 11.50% | 14.00%
Health Plans | Florida |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 970 | $ 643 | $ 734
Premium revenue percentage | 3.60% | 3.50% | 4.50%
Health Plans | Illinois |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 1,860 | $ 1,328 | $ 1,002
Premium revenue percentage | 6.90% | 7.30% | 6.20%
Health Plans | Kentucky |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 1,977 | $ 654 | $ 0
Premium revenue percentage | 7.40% | 3.60% | 0.00%
Health Plans | Michigan |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 1,915 | $ 1,587 | $ 1,624
Premium revenue percentage | 7.10% | 8.70% | 10.00%
Health Plans | New York |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 1,429 | $ 309 | $ 179
Premium revenue percentage | 5.30% | 1.70% | 1.10%
Health Plans | Ohio |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 3,172 | $ 2,962 | $ 2,553
Premium revenue percentage | 11.80% | 16.20% | 15.80%
Health Plans | Texas |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 3,959 | $ 3,085 | $ 2,991
Premium revenue percentage | 14.80% | 16.90% | 18.50%
Health Plans | Washington |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 4,420 | $ 3,169 | $ 2,695
Premium revenue percentage | 16.50% | 17.30% | 16.60%
Health Plans | Other |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Premium revenue | $ 4,751 | $ 2,453 | $ 2,164
Premium revenue percentage | 17.70% | 13.30% | 13.30%

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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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