Components of Property, Plant and Equipment (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 8,932	$ 8,638
Accumulated depreciation	(5,364)	(5,160)
Property, plant and equipment, net	3,568	3,478
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	239	229
Assets Held For Future Use
Property, Plant and Equipment [Line Items]
Construction in Progress, Gross	74
Computer Equipment and Capitalized Software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	6,182	5,973
Building and Building Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,237	2,089
Land
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	133	132
Construction in Progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 141	$ 215