Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 8,638	$ 7,733
Accumulated depreciation	(5,160)	(4,588)
Property, plant and equipment, net	3,478	3,145
Depreciation	867	780	728
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	229	197
Equipment and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,973	5,345
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,089	1,873
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	132	121
Building construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	215	197
Assets held for future use
Property, Plant and Equipment [Line Items]
Construction in progress on facilities held for future use	$ 74