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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Operating activities:    
Net (loss) income $ (153) $ 57
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 96 89
Impairment losses 72 0
Deferred income taxes (41) 39
Share-based compensation, including accelerated share-based compensation 35 16
Amortization of convertible senior notes and lease financing obligations 16 15
Other, net 7 11
Changes in operating assets and liabilities:    
Receivables (32) (415)
Prepaid expenses and other assets (38) (143)
Medical claims and benefits payable 148 82
Amounts due government agencies 642 509
Accounts payable and accrued liabilities (18) 147
Deferred revenue (32) (119)
Income taxes (30) (10)
Net cash provided by operating activities 672 278
Investing activities:    
Purchases of investments (1,636) (974)
Proceeds from sales and maturities of investments 874 812
Purchases of property, equipment and capitalized software (60) (102)
(Increase) decrease in restricted investments held-to-maturity (10) 5
Net cash paid in business combinations 0 (8)
Other, net (13) (6)
Net cash used in investing activities (845) (273)
Financing activities:    
Proceeds from senior notes offering, net of issuance costs 325 0
Proceeds from employee stock plans 11 10
Other, net (3) 1
Net cash provided by financing activities 333 11
Net increase in cash and cash equivalents 160 16
Cash and cash equivalents at beginning of period 2,819 2,329
Cash and cash equivalents at end of period 2,979 2,345
Schedule of non-cash investing and financing activities:    
Common stock used for share-based compensation (21) (7)
Details of change in fair value of derivatives, net:    
Change in fair value of derivatives, net 0 0
Details of business combinations:    
Fair value of assets acquired 0 (131)
Purchase price amounts accrued/received 0 21
Reversal of amounts advanced to sellers in prior year 0 102
Net cash paid in business combinations 0 (8)
1.125% Call Option    
Details of change in fair value of derivatives, net:    
Change in fair value of derivatives, net 173 (148)
1.125% Conversion Option    
Details of change in fair value of derivatives, net:    
Change in fair value of derivatives, net $ (173) $ 148