Property and Equipment (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 761	$ 667
Less accumulated depreciation and amortization	(333)	(301)
Property and equipment, net	428	366
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	106	109
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	224	223
Non-rental vehicles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	64	15
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	51	39
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	141	123
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 175	$ 158

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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