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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue:        
Premium revenue $ 8,240 $ 7,636 $ 24,167 $ 22,966
Premium tax revenue 176 223 517 646
Investment income 112 49 280 82
Other revenue 20 19 60 57
Total revenue 8,548 7,927 25,024 23,751
Operating expenses:        
Medical care costs 7,306 6,748 21,215 20,183
General and administrative expenses 608 560 1,817 1,682
Premium tax expenses 176 223 517 646
Depreciation and amortization 42 45 128 129
Other 57 16 90 43
Total operating expenses 8,189 7,592 23,767 22,683
Operating income 359 335 1,257 1,068
Other expenses, net:        
Interest expense 27 28 82 83
Total other expenses, net 27 28 82 83
Income before income tax expense 332 307 1,175 985
Income tax expense 87 77 300 249
Net income $ 245 $ 230 $ 875 $ 736
Net income per share:        
Net income per share - Basic (in dollars per share) $ 4.24 $ 4.00 $ 15.18 $ 12.74
Net income per share - Diluted (in dollars per share) $ 4.21 $ 3.95 $ 15.08 $ 12.58