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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Operating activities:    
Net income (loss) $ 506 $ (250)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:    
Depreciation and amortization 104 139
Deferred income taxes (32) (68)
Share-based compensation 20 38
Non-cash restructuring costs 17 49
Amortization of convertible senior notes and lease financing obligations 18 24
Gain on sale of subsidiary (37) 0
Loss on debt extinguishment 25 0
Impairment losses 0 201
Other, net 6 13
Changes in operating assets and liabilities:    
Receivables (507) (28)
Prepaid expenses and other current assets (117) (53)
Medical claims and benefits payable (144) 549
Amounts due government agencies (511) 122
Accounts payable and accrued liabilities 398 90
Deferred revenue (55) 153
Income taxes 118 (22)
Net cash (used in) provided by operating activities (191) 957
Investing activities:    
Purchases of investments (1,202) (1,894)
Proceeds from sales and maturities of investments 2,070 1,536
Purchases of property, equipment and capitalized software (24) (85)
Other, net (23) (33)
Net cash provided by (used in) investing activities 821 (476)
Financing activities:    
Repayment of credit facility (300) 0
Cash paid for partial settlement of 1.125% Conversion Option (477) 0
Cash received for partial termination of 1.125% Call Option 477 0
Cash paid for partial termination of 1.125% Warrants (419) 0
Proceeds from senior notes offerings, net of issuance costs 0 325
Proceeds from borrowings under credit facility 0 300
Other, net 7 7
Net cash (used in) provided by financing activities (1,012) 632
Net increase in cash, cash equivalents, and restricted cash and cash equivalents (382) 1,113
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 2,908 4,025
Schedule of non-cash investing and financing activities:    
Common stock used for share-based compensation (6) (21)
Details of change in fair value of derivatives, net:    
Change in fair value of derivatives, net 0 0
1.625% Notes exchange transaction:    
Common stock issued in exchange for 1.625% Notes 131 0
Component of 1.625% Notes allocated to additional paid-in capital, net of income taxes (23) 0
Net increase to additional paid-in capital 108 0
Details of sale of subsidiary:    
Decrease in carrying amount of assets (243) 0
Decrease in carrying amount of liabilities 59 0
Transaction costs (12) 0
Receivable from buyer - recorded in prepaid expenses and other current assets 233 0
Gain on sale of subsidiary 37 0
1.125% Call Option    
Details of change in fair value of derivatives, net:    
Change in fair value of derivatives, net 321 158
1.125% Conversion Option    
Details of change in fair value of derivatives, net:    
Change in fair value of derivatives, net (321) (158)
1.125% Notes    
Financing activities:    
Repayment of principal amount of Notes (236) 0
1.625% Notes    
Financing activities:    
Repayment of principal amount of Notes $ (64) $ 0