Components of Property, Plant and Equipment (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 9,173	$ 8,638
Accumulated depreciation	(5,567)	(5,160)
Property, plant and equipment, net	3,606	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	6,391	5,973
Building and Building Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,284	2,089
Land
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	159	132
Construction in Progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 100	$ 215