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Condensed Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Operating activities    
Net income $ 167 $ 203
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 70 61
Stock-based compensation expense 27 21
Excess tax benefit from stock-based compensation (4) (24)
Deferred income taxes 6 22
Changes in assets and liabilities:    
Receivables 157 (1)
Inventories (23) 26
Current payables and accrued expenses (72) (22)
Deferred revenue 46 72
Other assets and liabilities 9 (14)
Net cash provided by operating activities 383 344
Investing activities    
Expenditures for property and equipment (31) (31)
Additions to capitalized software (34) (38)
Business acquisitions and other investing activities, net (39) (238)
Net cash used in investing activities (104) (307)
Financing activities    
Repurchases of common stock (184) (37)
Repayments of long-term borrowings (8) (4)
Excess tax benefit from stock-based compensation 4 24
Other financing activities, net 15 36
Net cash (used in) provided by financing activities (173) 19
Effect of exchange rate changes on cash and cash equivalents (9) (7)
Increase in cash and cash equivalents 97 49
Cash and cash equivalents at beginning of period 729 772
Cash and cash equivalents at end of period $ 826 $ 821