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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating activities:    
Net income $ 107 $ 77
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 37 49
Deferred income taxes (6) (5)
Share-based compensation 6 6
Non-cash restructuring costs 17 0
Amortization of convertible senior notes and lease financing obligations 7 8
Loss on debt extinguishment 10 0
Other, net 2 3
Changes in operating assets and liabilities:    
Receivables (83) (32)
Prepaid expenses and other current assets (239) (12)
Medical claims and benefits payable (163) (3)
Amounts due government agencies 172 373
Accounts payable and accrued liabilities 319 50
Deferred revenue 130 146
Income taxes 78 59
Net cash provided by operating activities 394 719
Investing activities:    
Purchases of investments (389) (733)
Proceeds from sales and maturities of investments 543 433
Purchases of property, equipment and capitalized software (4) (26)
Increase in restricted investments held-to-maturity 0 (5)
Other, net (5) (6)
Net cash provided by (used in) investing activities 145 (337)
Financing activities:    
Cash paid for financing transaction fees (5) 0
Proceeds from employee stock plans 0 1
Other, net 0 (2)
Net cash used in financing activities (5) (1)
Net increase in cash, cash equivalents, and restricted cash and cash equivalents 534 381
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period 3,290 2,912
Cash, cash equivalents, and restricted cash and cash equivalents at end of period 3,824 3,293
Schedule of non-cash investing and financing activities:    
Common stock used for share-based compensation (5) (6)
Details of change in fair value of derivatives, net:    
Change in fair value of derivatives, net 0 0
1.625% Convertible Notes exchange transaction:    
Common stock issued in exchange for 1.625% Convertible Notes 131 0
Component of 1.625% Convertible Notes allocated to additional paid-in capital, net of income taxes (23) 0
Net increase to additional paid-in capital 108 0
1.125% Call Option    
Details of change in fair value of derivatives, net:    
Change in fair value of derivatives, net 63 (86)
1.125% Conversion Option    
Details of change in fair value of derivatives, net:    
Change in fair value of derivatives, net $ (63) $ 86