Fixed Assets at cost (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Gross Property and Equipment	$ 9,582	[1]	$ 5,786	[1]
Total accumulated depreciation	2,522	[1]	1,369	[1]
Total property and equipment, net	7,060		4,417
Land and Buildings
Property, Plant and Equipment [Line Items]
Gross Property and Equipment	2,966	[1]	1,437	[1]
Equipment and Internal Use Software
Property, Plant and Equipment [Line Items]
Gross Property and Equipment	6,228	[1],[2]	4,106	[1],[2]
Other Corporate Assets
Property, Plant and Equipment [Line Items]
Gross Property and Equipment	174	[1]	137	[1]
Construction in Progress
Property, Plant and Equipment [Line Items]
Gross Property and Equipment	$ 214	[1]	$ 106	[1]

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

[2] Includes internal-use software of $866 million and $623 million at December 31, 2012 and 2011.