Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities
Net income	$ 59	$ 91
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	34	30
Stock-based compensation expense	13	11
Excess tax benefit from stock-based compensation	(3)	(17)
Deferred income taxes	6	13
Changes in assets and liabilities:
Receivables	158	(5)
Inventories	(18)	7
Current payables and accrued expenses	(87)	(43)
Deferred revenue	84	116
Other assets and liabilities	(3)	(11)
Net cash provided by operating activities	243	192
Investing activities
Expenditures for property and equipment	(10)	(12)
Additions to capitalized software	(17)	(18)
Net cash used in investing activities	(27)	(30)
Financing activities
Repurchases of common stock	(93)	0
Repayments of long-term borrowings	(4)	0
Excess tax benefit from stock-based compensation	3	17
Other financing activities, net	7	24
Net cash (used in) provided by financing activities	(87)	41
Effect of exchange rate changes on cash and cash equivalents	(5)	3
Increase in cash and cash equivalents	124	206
Cash and cash equivalents at beginning of period	729	772
Cash and cash equivalents at end of period	$ 853	$ 978