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Significant Accounting Policies - Schedule of Premium Revenue (Details) - Health Plans - USD ($)
$ in Millions
 12 Months Ended
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%