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Condensed Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Operating activities    
Net income $ 265 $ 307
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 109 93
Stock-based compensation expense 39 31
Excess tax benefit from stock-based compensation (7) (33)
Deferred income taxes 7 28
Changes in assets and liabilities:    
Receivables 126 (20)
Inventories (19) 21
Current payables and accrued expenses (86) 23
Deferred revenue (5) 19
Other assets and liabilities 18 (18)
Net cash provided by operating activities 447 451
Investing activities    
Expenditures for property and equipment (44) (49)
Additions to capitalized software (56) (60)
Business acquisitions and other investing activities, net (39) (239)
Net cash used in investing activities (139) (348)
Financing activities    
Repurchases of common stock (187) (39)
Repayments of long-term borrowings (11) (8)
Excess tax benefit from stock-based compensation 7 33
Other financing activities, net 23 48
Net cash (used in) provided by financing activities (168) 34
Effect of exchange rate changes on cash and cash equivalents (7) 0
Increase in cash and cash equivalents 133 137
Cash and cash equivalents at beginning of period 729 772
Cash and cash equivalents at end of period $ 862 $ 909