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Segments - Reconciliation of Gross Margin to Consolidated Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Add: other operating revenues $ 4,618 $ 4,193 $ 9,167 $ 8,312
Less: other operating expenses (4,194) (3,928) (8,469) (7,767)
Operating income 424 265 698 545
Other expenses, net 29 8 50 28
Income before income tax expense 395 257 648 517
Other operating        
Segment Reporting Information [Line Items]        
Add: other operating revenues 246 144 491 311
Less: other operating expenses (596) (462) (1,155) (930)
Health Plans        
Segment Reporting Information [Line Items]        
Add: other operating revenues 4,616 4,190 9,161 8,307
Health Plans | Operating segments        
Segment Reporting Information [Line Items]        
Gross margin 774 583 1,362 1,164
Other        
Segment Reporting Information [Line Items]        
Add: other operating revenues $ 2 $ 3 $ 6 $ 5