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Consolidated Statements of Cash Flows
$ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Transaction
Operating activities      
Net (loss) income $ (214) $ 367 $ 377
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 170 169 147
Stock-based compensation expense 56 50 49
Excess tax benefit from stock-based compensation (2) (2) (7)
Deferred income taxes (39) (2) 18
(Gain) loss on investments (57) 9 25
Impairment of goodwill and acquired intangibles 478 0 0
Changes in assets and liabilities, net of acquisitions:      
Receivables 1 101 (46)
Inventories (11) 18 (9)
Current payables and accrued expenses (8) (23) (63)
Deferred revenue 24 (28) 9
Other assets and liabilities 3 21 10
Net cash provided by operating activities 401 680 510
Investing activities      
Expenditures for property and equipment (52) (54) (60)
Additions to capitalized software (68) (75) (78)
Proceeds from disposition of investments $ 85 $ 0 $ 0
Business acquisitions and other investing activities, net (17) (69) (2)
Net cash used in investing activities $ (52) $ (198) $ (174)
Financing activities      
Proceeds from long-term borrowings 600 0 0
Repayments of long-term borrowings (247) (26) (15)
Proceeds from credit facility borrowings 180 220  
Repayments of credit-facility borrowings (220) 0 0
Repurchases of common stock (657) (551) (382)
Excess tax benefit from stock-based compensation 2 2 7
Other financing activities, net 18 29 28
Net cash used in financing activities (324) (326) (362)
Effect of exchange rate changes on cash and cash equivalents (20) (17) (8)
Increase (decrease) in cash and cash equivalents 5 139 (34)
Cash and cash equivalents at beginning of year 834 695 729
Cash and cash equivalents at end of year 839 834 695
Cash paid during the year for:      
Income taxes 98 133 124
Interest $ 8 $ 3 $ 4