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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Operating activities:    
Net income $ 506 $ 413
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 84 64
Deferred income taxes 3 7
Share-based compensation 57 35
Other, net (6) 10
Changes in operating assets and liabilities:    
Receivables (43) (192)
Prepaid expenses and other current assets (64) (6)
Medical claims and benefits payable 405 272
Amounts due government agencies 247 792
Accounts payable, accrued liabilities and other (147) (15)
Deferred revenue (357) (333)
Income taxes 46 14
Net cash provided by operating activities 731 1,061
Investing activities:    
Purchases of investments (1,413) (1,006)
Proceeds from sales and maturities of investments 879 622
Purchases of property, equipment and capitalized software (50) (29)
Other, net (7) 5
Net cash used in investing activities (591) (408)
Financing activities:    
Common stock purchases (200) (128)
Common stock withheld to settle employee tax obligations (53) (52)
Contingent consideration liabilities settled (20) (20)
Other, net 5 0
Net cash used in financing activities (268) (200)
Net (decrease) increase in cash, cash equivalents, and restricted cash and cash equivalents (128) 453
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period 4,506 4,223
Cash, cash equivalents, and restricted cash and cash equivalents at end of period $ 4,378 $ 4,676