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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Operating activities    
Net income (loss) $ 67 $ (165)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 97 129
Stock-based compensation expense 49 43
Excess tax benefit from stock-based compensation (3) 0
Deferred income taxes (9) (10)
Gain on investments 0 (50)
Impairment of goodwill, acquired intangibles and other assets 80 340
Changes in assets and liabilities:    
Receivables 162 134
Inventories 4 (14)
Current payables and accrued expenses (14) (25)
Deferred revenue (7) 13
Other assets and liabilities (31) (25)
Net cash provided by operating activities 395 370
Investing activities    
Expenditures for property and equipment (32) (43)
Proceeds from sales of property and equipment 5 0
Additions to capitalized software (54) (51)
Proceeds from the disposition of investments 0 69
Proceeds from sale of business $ 92 $ 0
Business acquisitions and other investing activities, net (16) (9)
Net cash used in investing activities $ (5) $ (34)
Financing activities    
Repurchases of common stock (69) (541)
Proceeds from long-term borrowings 0 600
Repayments of long-term borrowings (22) (247)
Proceeds from credit facility borrowings 0 110
Repayments of credit facility borrowings (180) (220)
Excess tax benefit from stock-based compensation 3 0
Other financing activities, net 24 18
Net cash used in financing activities (244) (280)
Effect of exchange rate changes on cash and cash equivalents 3 (16)
Increase in cash and cash equivalents 149 40
Cash and cash equivalents at beginning of period 839 834
Cash and cash equivalents at end of period $ 988 $ 874