Consolidated Statement of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Income Statement [Abstract]
Net Revenue	$ 1,906		$ 1,758
Operating Expenses
General and administrative	608		579
Advertising and marketing	129		125
Depreciation and amortization	62		54
Total operating expenses	799		758
Operating income	1,107		1,000
Other Income (Expense)
Investment income	8		9
Interest expense	(5)		(6)
Other income (expense)	(8)		(3)
Total other income (expense)	(5)		0
Income before income taxes	1,102		1,000
Income tax expense	336		318
Net Income	$ 766		$ 682
Basic Earnings per Share	$ 6.25		$ 5.38
Basic Weighted-Average Shares Outstanding	123		127
Diluted Earnings per Share	$ 6.23		$ 5.36
Diluted Weighted-Average Shares Outstanding	123	[1]	127	[1]

[1] For the periods presented, the calculation of diluted EPS excluded a minimal amount of anti-dilutive share-based payment awards.