Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		$ 1,307	$ 1,290
Less accumulated depreciation and amortization		(747)	(681)
Property, plant and equipment, Net	537	560	609
Land and buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		341	359
Information and communication equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		839	771
Furniture, equipment and other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		$ 127	$ 160

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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