Supplemental Balance Sheet Information (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 22,525	$ 21,166
Less: Accumulated depreciation	(14,147)	(13,500)
Property, plant and equipment - net	8,378	7,666
Accumulated depreciation for capital leases included in Accumulated depreciation	73	60
Land
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	413	377
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	6,975	6,587
Machinery and equipment
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	14,190	13,240
Construction in progress
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	791	814
Capital leases
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 156	$ 148

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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