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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating activities      
Net income (loss) $ 125 $ (214) $ 367
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 128 170 169
Stock-based compensation expense 62 56 50
Excess tax benefit from stock-based compensation 0 (2) (2)
Deferred income taxes (3) (39) (2)
(Gain) loss on investments (2) (57) 9
Impairment of goodwill, acquired intangibles and other assets 80 478 0
Changes in assets and liabilities, net of acquisitions:      
Receivables 40 1 101
Inventories 14 (11) 18
Account payables and accrued expenses 11 (8) (23)
Deferred revenue 1 24 (28)
Other assets and liabilities (10) 3 21
Net cash provided by operating activities 446 401 680
Investing activities      
Expenditures for property and equipment (53) (52) (54)
Additions to capitalized software (65) (68) (75)
Proceeds from sales of property and equipment 5 0 0
Proceeds from disposition of investments 2 85 0
Proceeds from sale of business $ 92 $ 0 $ 0
Business acquisitions and other investing activities, net (16) (17) (69)
Net cash used in investing activities $ (35) $ (52) $ (198)
Financing activities      
Proceeds from long-term borrowings 0 600 0
Repayments of long-term borrowings (30) (247) (26)
Proceeds from credit facility borrowings 0 180 220
Repayments of credit-facility borrowings (180) (220) 0
Repurchases of common stock (82) (657) (551)
Excess tax benefit from stock-based compensation 0 2 2
Other financing activities, net 30 18 29
Net cash used in financing activities (262) (324) (326)
Effect of exchange rate changes on cash and cash equivalents (14) (20) (17)
Increase in cash and cash equivalents 135 5 139
Cash and cash equivalents at beginning of year 839 834 695
Cash and cash equivalents at end of year 974 839 834
Cash paid during the year for:      
Income taxes 105 98 133
Interest $ 12 $ 8 $ 3