Summary of Property and Equipment (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Property Plant And Equipment [Line Items]
Land and land improvements	$ 1,939	$ 1,996
Buildings and leasehold improvements	13,483	13,665
Furniture and equipment	2,212	2,227
Construction in progress	163	199
Property, Plant and Equipment, Gross, Total	17,797	18,087
Less accumulated depreciation and amortization	(6,596)	(6,499)
Property and equipment, net	$ 11,201	$ 11,588

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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