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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Operating activities:    
Net income $ 630 $ 506
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 86 84
Deferred income taxes (4) 3
Share-based compensation 55 57
Other, net 5 (6)
Changes in operating assets and liabilities:    
Receivables (83) (43)
Prepaid expenses and other current assets 6 (64)
Medical claims and benefits payable 149 405
Amounts due government agencies 510 247
Accounts payable, accrued liabilities and other (208) (147)
Deferred revenue 55 (357)
Income taxes 202 46
Net cash provided by operating activities 1,403 731
Investing activities:    
Purchases of investments (924) (1,413)
Proceeds from sales and maturities of investments 546 879
Purchases of property, equipment and capitalized software (63) (50)
Other, net 2 (7)
Net cash used in investing activities (439) (591)
Financing activities:    
Common stock withheld to settle employee tax obligations (59) (53)
Common stock purchases 0 (200)
Contingent consideration liabilities settled 0 (20)
Other, net 4 5
Net cash used in financing activities (55) (268)
Net increase (decrease) in cash, cash equivalents, and restricted cash and cash equivalents 909 (128)
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period 4,048 4,506
Cash, cash equivalents, and restricted cash and cash equivalents at end of period $ 4,957 $ 4,378