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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities      
Net (loss) income $ (67) $ 125 $ (214)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:      
Depreciation and amortization 138 128 170
Stock-based compensation expense 68 62 56
Excess tax benefit from stock-based compensation 0 0 (2)
Deferred income taxes (34) (3) (39)
Gain on investments 0 (2) (57)
Impairment of goodwill, acquired intangibles and other assets 0 80 478
Changes in assets and liabilities, net of acquisitions:      
Receivables (6) 40 1
Inventories 3 14 (11)
Account payables and accrued expenses 12 11 (8)
Deferred revenue 115 1 24
Other assets and liabilities 95 (10) 3
Net cash provided by operating activities 324 446 401
Investing activities      
Expenditures for property and equipment (78) (53) (52)
Additions to capitalized software (9) (65) (68)
Proceeds from sales of property and equipment 0 5 0
Proceeds from disposition of investments 0 2 85
Proceeds from sale of business $ 0 $ 92 $ 0
Business acquisitions and other investing activities, net (21) (16) (17)
Net cash used in investing activities $ (108) $ (35) $ (52)
Financing activities      
Proceeds from long-term borrowings 0 0 600
Repayments of long-term borrowings (30) (30) (247)
Proceeds from credit facility borrowings 420 0 180
Repayments of credit-facility borrowings (180) (180) (220)
Repurchases of common stock (351) (82) (657)
Excess tax benefit from stock-based compensation 0 0 2
Other financing activities, net 32 30 18
Net cash used in financing activities (109) (262) (324)
Effect of exchange rate changes on cash and cash equivalents 8 (14) (20)
Increase in cash and cash equivalents 115 135 5
Cash and cash equivalents at beginning of year 974 839 834
Cash and cash equivalents at end of year 1,089 974 839
Cash paid during the year for:      
Income taxes 25 105 98
Interest $ 14 $ 12 $ 8