Property and Equipment (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 667	$ 673
Less accumulated depreciation and amortization	(301)	(280)
Property and equipment, net	366	393
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	109	112
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	223	227
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15	20
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	39	39
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	123	109
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 158	$ 166

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, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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