Supplemental Balance Sheet Information (Accrued Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Supplemental Balance Sheet Information [Abstract]
Accrued compensation and benefits	$ 171	$ 161
Marketing programs and advertising expenses	210	223
Software technology and licenses payable	19	20
Other	156	146
Total accrued liabilities	$ 556	$ 550	[1]

[1] Amounts as of December 31, 2011 were derived from the December 31, 2011 audited financial statements.