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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities:    
Net income $ 228 $ 178
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 33 20
Deferred income taxes 6 14
Share-based compensation 24 12
Other, net 12 (3)
Changes in operating assets and liabilities:    
Receivables (98) (197)
Prepaid expenses and other current assets (15) (229)
Medical claims and benefits payable 168 127
Amounts due government agencies 432 113
Accounts payable, accrued liabilities and other 16 254
Deferred revenue (304) (206)
Income taxes 66 60
Net cash provided by operating activities 568 143
Investing activities:    
Purchases of investments (388) (578)
Proceeds from sales and maturities of investments 308 493
Purchases of property, equipment and capitalized software (16) (21)
Other, net 9 3
Net cash used in investing activities (87) (103)
Financing activities:    
Common stock purchases (128) (453)
Common Stock Withheld to Settle Employee Tax Obligations (51) (7)
Contingent consideration liabilities settled (20) 0
Proceeds from borrowings under term loan facility 0 380
Other, net (8) (45)
Net cash used in financing activities (207) (125)
Net increase (decrease) in cash, cash equivalents, and restricted cash and cash equivalents 274 (85)
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period 4,223 2,508
Cash, cash equivalents, and restricted cash and cash equivalents at end of period $ 4,497 $ 2,423