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Segments - Schedule of Operating Segment Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Total revenue $ 19,423 $ 16,829 $ 18,890
Margin 2,479 2,303 2,518
Total assets 9,532 6,787 7,154
Health Plans      
Segment Reporting Information [Line Items]      
Total revenue 19,415 16,815 18,471
Total assets 8,359 5,265 6,165
Other      
Segment Reporting Information [Line Items]      
Total revenue 8 14 419
Margin 0 0 43
Total assets $ 1,173 $ 1,522 $ 989