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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities:    
Net income $ 413 $ 454
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 64 41
Deferred income taxes 7 6
Share-based compensation 35 28
Loss on debt repayment 0 5
Other, net 10 (1)
Changes in operating assets and liabilities:    
Receivables (192) (174)
Prepaid expenses and other current assets (6) (157)
Medical claims and benefits payable 272 106
Amounts due government agencies 792 201
Accounts payable, accrued liabilities and other (15) 259
Deferred revenue (333) (195)
Income taxes 14 184
Net cash provided by operating activities 1,061 757
Investing activities:    
Purchases of investments (1,006) (670)
Proceeds from sales and maturities of investments 622 750
Purchases of property, equipment and capitalized software (29) (45)
Other, net 5 3
Net cash (used in) provided by investing activities (408) 38
Financing activities:    
Common stock purchases (128) (453)
Common stock withheld to settle employee tax obligations (52) (8)
Contingent consideration liabilities settled (20) 0
Proceeds from senior notes offering, net of issuance costs 0 789
Repayment of term loan facility 0 (600)
Proceeds from borrowings under term loan facility 0 380
Other, net 0 (45)
Net cash (used in) provided by financing activities (200) 63
Net increase in cash, cash equivalents, and restricted cash and cash equivalents 453 858
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 $ 4,676 $ 3,366