Total Assets, Fixed Assets, Net and Total Fixed Asset Additions, by Segment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 25,278		$ 18,797
Fixed assets, net	4,417	[1]	2,414	[1]
Total fixed asset additions	3,044		1,686
North America
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	16,461		12,460
Fixed assets, net	3,413		1,958
Total fixed asset additions	2,259		1,365
International
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	8,817		6,337
Fixed assets, net	1,004		456
Total fixed asset additions	$ 785		$ 321

[1] Excludes the original cost and accumulated depreciation of fully-depreciated assets.