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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating activities    
Net income $ 7 $ 67
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 103 97
Stock-based compensation expense 51 49
Deferred income taxes (22) (9)
Impairment of goodwill, acquired intangibles and other assets 0 80
Changes in assets and liabilities:    
Receivables 182 162
Inventories (11) 4
Current payables and accrued expenses 0 (14)
Deferred revenue (2) (7)
Other assets and liabilities (7) (35)
Net cash provided by operating activities 301 394
Investing activities    
Expenditures for property and equipment (59) (32)
Proceeds from sale of property and equipment 0 5
Additions to capitalized software (7) (54)
Proceeds from sale of business $ 0 $ 92
Business acquisitions and other investing activities, net (18) (16)
Net cash used in investing activities $ (84) $ (5)
Financing activities    
Repurchases of common stock (351) (69)
Repayments of long-term borrowings (23) (22)
Proceeds from credit facility borrowings 180 0
Repayments of credit facility borrowings 0 (180)
Other financing activities, net 20 28
Net cash used in financing activities (174) (243)
Effect of exchange rate changes on cash and cash equivalents 8 3
Increase in cash and cash equivalents 51 149
Cash and cash equivalents at beginning of period 974 839
Cash and cash equivalents at end of period $ 1,025 $ 988