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Condensed Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Operating activities    
Net income $ 249 $ 265
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 128 109
Stock-based compensation expense 36 39
Excess tax benefit from stock-based compensation (2) (7)
Deferred income taxes (17) 7
Loss on investments 9 0
Changes in assets and liabilities:    
Receivables 199 126
Inventories 12 (19)
Current payables and accrued expenses (10) (86)
Deferred revenue (13) (5)
Other assets and liabilities (8) 18
Net cash provided by operating activities 583 447
Investing activities    
Expenditures for property and equipment (37) (44)
Additions to capitalized software (57) (56)
Business acquisitions and other investing activities, net (49) (39)
Net cash used in investing activities (143) (139)
Financing activities    
Repurchases of common stock (282) (187)
Repayments of long-term borrowings (19) (11)
Excess tax benefit from stock-based compensation 2 7
Other financing activities, net 20 23
Net cash used in financing activities (279) (168)
Effect of exchange rate changes on cash and cash equivalents (8) (7)
Increase in cash and cash equivalents 153 133
Cash and cash equivalents at beginning of period 695 729
Cash and cash equivalents at end of period $ 848 $ 862