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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Operating activities    
Net (loss) income $ (6) $ 18
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 70 65
Stock-based compensation expense 35 33
Deferred income taxes (20) (15)
Impairment of goodwill, acquired intangibles and other assets 0 80
Changes in assets and liabilities:    
Receivables 192 122
Inventories (8) 11
Current payables and accrued expenses (13) (10)
Deferred revenue 58 64
Other assets and liabilities 1 (19)
Net cash provided by operating activities 309 349
Investing activities    
Expenditures for property and equipment (30) (17)
Proceeds from sale of property and equipment 0 5
Additions to capitalized software (4) (36)
Business acquisitions and other investing activities, net (18) (4)
Net cash used in investing activities (52) (52)
Financing activities    
Repurchases of common stock (151) (51)
Repayments of long-term borrowings (15) (15)
Repayments of credit facility borrowings 0 (180)
Other financing activities, net 12 19
Net cash used in financing activities (154) (227)
Effect of exchange rate changes on cash and cash equivalents 8 0
Increase in cash and cash equivalents 111 70
Cash and cash equivalents at beginning of period 974 839
Cash and cash equivalents at end of period $ 1,085 $ 909