Components of Property, Plant and Equipment (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 8,171	$ 7,733
Accumulated depreciation	(4,880)	(4,588)
Property, plant and equipment, net	3,291	3,145
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	209	197
Assets Held For Future Use [Member]
Property, Plant and Equipment [Line Items]
Construction in Progress, Gross	74
Computer Equipment and Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,636	5,345
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,955	1,873
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	121	121
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 250	$ 197

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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