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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating activities      
Net income $ 419 $ 353 $ 301
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 126 102 60
Stock-based compensation expense 43 35 26
Excess tax benefit from stock-based compensation (37) (14) (10)
Deferred income taxes 77 71 41
Gain on investments 0 (28) 0
Changes in assets and liabilities:      
Receivables (165) (65) (15)
Inventories 14 3 (18)
Current payables and accrued expenses 105 28 9
Deferred revenue 42 45 10
Other assets and liabilities (49) (17) 9
Net cash provided by operating activities 575 513 413
Investing activities      
Expenditures for property and equipment (67) (42) (34)
Additions to capitalized software (81) (68) (49)
Business acquisitions and other investing activities, net (274) (722) (62)
Net cash used in investing activities (422) (832) (145)
Financing activities      
Proceeds from long-term borrowings 0 600 0
Repayments of long-term borrowings (11) (300) 0
Repurchases of common stock (277) (127) (88)
Excess tax benefit from stock-based compensation 37 14 10
Other financing activities, net 55 25 31
Net cash (used in) provided by financing activities (196) 212 (47)
Effect of exchange rate changes on cash and cash equivalents 0 (4) 1
(Decrease) increase in cash and cash equivalents (43) (111) 222
Cash and cash equivalents at beginning of year 772 883 661
Cash and cash equivalents at end of year 729 772 883
Cash paid during the year for:      
Income taxes 54 56 89
Interest $ 4 $ 3 $ 0