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Condensed Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Operating activities    
Net income $ 155 $ 167
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 84 70
Stock-based compensation expense 25 27
Excess tax benefit from stock-based compensation (1) (4)
Deferred income taxes (12) 6
Loss on investments 9 0
Changes in assets and liabilities:    
Receivables 168 157
Inventories 6 (23)
Current payables and accrued expenses 2 (72)
Deferred revenue 53 46
Other assets and liabilities (8) 9
Net cash provided by operating activities 481 383
Investing activities    
Expenditures for property and equipment (21) (31)
Additions to capitalized software (37) (34)
Business acquisitions and other investing activities (7) (39)
Net cash used in investing activities (65) (104)
Financing activities    
Repurchases of common stock (184) (184)
Repayments of long-term borrowings (11) (8)
Excess tax benefit from stock-based compensation 1 4
Other financing activities, net 14 15
Net cash used in financing activities (180) (173)
Effect of exchange rate changes on cash and cash equivalents 3 (9)
Increase in cash and cash equivalents 239 97
Cash and cash equivalents at beginning of period 695 729
Cash and cash equivalents at end of period $ 934 $ 826