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Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue:      
Investment income and other revenue $ 76 $ 132 $ 125
Total revenue 19,423 16,829 18,890
Operating expenses:      
General and administrative expenses 1,480 1,296 1,333
Premium tax expenses 649 489 417
Health insurer fees 277 0 348
Depreciation and amortization 88 89 99
Other 31 6 61
Total operating expenses 18,345 15,785 17,759
Operating income 1,078 1,044 1,131
Other expenses, net:      
Interest expense 102 87 115
Other expenses (income), net 15 (15) 17
Total other expenses, net 117 72 132
Income before income tax expense 961 972 999
Income tax expense 288 235 292
Net income $ 673 $ 737 $ 707
Net income per share:      
Basic (in dollars per share) $ 11.40 $ 11.85 $ 11.57
Diluted (in dollars per share) $ 11.23 $ 11.47 $ 10.61
Weighted average shares outstanding:      
Basic (in shares) 59.0 62.2 61.1
Diluted (in shares) 59.9 64.2 66.6
Premium revenue      
Revenue:      
Revenues $ 18,299 $ 16,208 $ 17,612
Premium tax revenue      
Revenue:      
Revenues 649 489 417
Health insurer fees reimbursed      
Revenue:      
Revenues 271 0 329
Marketplace risk corridor judgment      
Revenue:      
Revenues 128 0 0
Service      
Revenue:      
Revenues 0 0 407
Operating expenses:      
Cost of revenue 0 0 364
Medical care costs      
Operating expenses:      
Cost of revenue $ 15,820 $ 13,905 $ 15,137