PROPERTY AND EQUIPMENT (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Components of property and equipment
Gross property and equipment	$ 7,736	$ 7,404
Accumulated depreciation and amortization	(3,386)	(3,100)
Net property and equipment	4,350	4,304
Accrued property and equipment purchases for items received but not yet paid	109	91
Accrued property and equipment purchases, for items received but not yet paid, included in accounts payable	104	87
Land
Components of property and equipment
Gross property and equipment	350	352
Buildings and improvements
Components of property and equipment
Gross property and equipment	4,102	3,984
Construction in progress
Components of property and equipment
Gross property and equipment	236	205
Equipment
Components of property and equipment
Gross property and equipment	$ 3,048	$ 2,863

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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