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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenue:        
Premium revenue $ 8,042 $ 7,799 $ 15,927 $ 15,330
Premium tax revenue 169 215 341 423
Investment income 97 22 168 33
Other revenue 19 18 40 38
Total revenue 8,327 8,054 16,476 15,824
Operating expenses:        
Medical care costs 7,038 6,872 13,909 13,435
General and administrative expenses 618 551 1,209 1,122
Premium tax expenses 169 215 341 423
Depreciation and amortization 42 44 86 84
Other 17 11 33 27
Total operating expenses 7,884 7,693 15,578 15,091
Operating income 443 361 898 733
Other expenses, net:        
Interest expense 27 27 55 55
Total other expenses, net 27 27 55 55
Income before income tax expense 416 334 843 678
Income tax expense 107 86 213 172
Net income $ 309 $ 248 $ 630 $ 506
Net income per share:        
Net income per share - Basic (in dollars per share) $ 5.37 $ 4.29 $ 10.95 $ 8.74
Net income per share - Diluted (in dollars per share) $ 5.35 $ 4.25 $ 10.87 $ 8.63