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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities:    
Net income (loss) $ 309 $ (153)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 73 96
Impairment losses 0 72
Deferred income taxes (6) (41)
Share-based compensation 13 35
Non-cash restructuring costs 17 0
Amortization of convertible senior notes and lease financing obligations 13 16
Loss on debt extinguishment 15 0
Other, net 4 7
Changes in operating assets and liabilities:    
Receivables (315) (32)
Prepaid expenses and other current assets (181) (38)
Medical claims and benefits payable (267) 148
Amounts due government agencies 205 642
Accounts payable and accrued liabilities 349 (18)
Deferred revenue (42) (32)
Income taxes 127 (30)
Net cash provided by operating activities 314 672
Investing activities:    
Purchases of investments (914) (1,636)
Proceeds from sales and maturities of investments 1,335 874
Purchases of property, equipment and capitalized software (14) (60)
Other, net (9) (24)
Net cash provided by (used in) investing activities 398 (846)
Financing activities:    
Repayment of credit facility (300) 0
Repayment of 1.125% Convertible Notes (89) 0
Cash paid for partial settlement of 1.125% Conversion Option (134) 0
Cash received for partial termination of 1.125% Call Option 134 0
Cash paid for partial termination of 1.125% Warrants (113) 0
Proceeds from senior notes offerings, net of issuance costs 0 325
Other, net (1) 8
Net cash (used in) provided by financing activities (503) 333
Net increase in cash, cash equivalents, and restricted cash and cash equivalents 209 159
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 3,499 3,071
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% 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 135 173
1.125% Conversion Option    
Financing activities:    
Cash received for partial termination of 1.125% Call Option 134  
Details of change in fair value of derivatives, net:    
Change in fair value of derivatives, net $ (135) $ (173)