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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating activities:    
Net income $ 321 $ 258
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 44 40
Deferred income taxes 1 16
Share-based compensation 25 34
Other, net 5 (8)
Changes in operating assets and liabilities:    
Receivables (234) 21
Prepaid expenses and other current assets 7 (32)
Medical claims and benefits payable 296 263
Amounts due government agencies 270 137
Accounts payable, accrued liabilities and other (215) (81)
Deferred revenue 295 (352)
Income taxes 101 67
Net cash provided by operating activities 916 363
Investing activities:    
Purchases of investments (646) (403)
Proceeds from sales and maturities of investments 371 513
Purchases of property, equipment and capitalized software (32) (23)
Other, net 5 (13)
Net cash (used in) provided by investing activities (302) 74
Financing activities:    
Common stock withheld to settle employee tax obligations (58) (52)
Contingent consideration liabilities settled 0 (20)
Other, net (7) (5)
Net cash used in financing activities (65) (77)
Net increase in cash, cash equivalents, and restricted cash and cash equivalents 549 360
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 $ 4,597 $ 4,866