Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating activities
Net income	$ 353	$ 301	$ 254
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	102	60	63
Stock-based compensation expense	35	26	23
Excess tax benefit from stock-based compensation	(14)	(10)	(5)
Deferred income taxes	71	41	41
Gain on investments	(28)	0	0
Impairment of equity investment	0	0	5
Changes in assets and liabilities:
Receivables	(65)	(15)	60
Inventories	3	(18)	(2)
Current payables and accrued expenses	28	9	15
Deferred revenue	45	10	(4)
Other assets and liabilities	(17)	9	5
Net cash provided by operating activities	513	413	455
Investing activities
Purchases of short-term investments	0	0	(25)
Proceeds from sales and maturities of short-term investments	0	0	65
Expenditures for property and equipment	(42)	(34)	(29)
Additions to capitalized software	(68)	(49)	(59)
Business acquisitions and other investing activities, net	(722)	(62)	(9)
Net cash used in investing activities	(832)	(145)	(57)
Financing activities
Proceeds from long-term borrowings	600	0	0
Repayments of long-term borrowings	(300)	0	0
Repurchases of common stock	(127)	(88)	(174)
Excess tax benefit from stock-based compensation	14	10	5
Other financing activities, net	25	31	25
Net cash provided by (used in) financing activities	212	(47)	(144)
Effect of exchange rate changes on cash and cash equivalents	(4)	1	5
(Decrease) increase in cash and cash equivalents	(111)	222	259
Cash and cash equivalents at beginning of year	883	661	402
Cash and cash equivalents at end of year	772	883	661
Supplemental data
Income taxes	56	89	44
Interest	$ 3	$ 0	$ 0