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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating activities    
Net loss $ (2) $ (46)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 36 34
Stock-based compensation expense 16 21
Deferred income taxes (8) (10)
Impairment of goodwill, acquired intangibles and other assets 0 80
Changes in assets and liabilities:    
Receivables 106 66
Inventories (6) (5)
Current payables and accrued expenses (44) (16)
Deferred revenue 145 140
Other assets and liabilities 5 (14)
Net cash provided by operating activities 248 250
Investing activities    
Expenditures for property and equipment (16) (8)
Additions to capitalized software $ (2) $ (18)
Business acquisitions and other investing activities, net 0 (3)
Net cash used in investing activities $ (18) $ (29)
Financing activities    
Repurchases of common stock (43) (47)
Repayments of long-term borrowings (8) (7)
Repayments of credit facility borrowings 0 (100)
Other financing activities, net 7 9
Net cash used in financing activities (44) (145)
Effect of exchange rate changes on cash and cash equivalents 4 2
Increase in cash and cash equivalents 190 78
Cash and cash equivalents at beginning of period 974 839
Cash and cash equivalents at end of period $ 1,164 $ 917