Property, Plant, and Equipment (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 15,588	$ 12,906
Less accumulated depreciation	7,096	6,064
Net property, plant, and equipment	8,492	6,842
Land [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	123	105
Buildings and property improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	1,609	1,438
Buildings and property improvements [Member] \| 1 through 10 Years [Member]
Property, plant and equipment useful lives and total depreciated percentages [Abstract]
Ratio of depreciation by useful asset life over total depreciation of asset (in hundredths)	13.00%	13.00%
Buildings and property improvements [Member] \| 11 through 20 Years [Member]
Property, plant and equipment useful lives and total depreciated percentages [Abstract]
Ratio of depreciation by useful asset life over total depreciation of asset (in hundredths)	47.00%	46.00%
Buildings and property improvements [Member] \| 21 through 30 Years [Member]
Property, plant and equipment useful lives and total depreciated percentages [Abstract]
Ratio of depreciation by useful asset life over total depreciation of asset (in hundredths)	13.00%	13.00%
Buildings and property improvements [Member] \| 31 through 40 Years [Member]
Property, plant and equipment useful lives and total depreciated percentages [Abstract]
Ratio of depreciation by useful asset life over total depreciation of asset (in hundredths)	27.00%	28.00%
Machinery, equipment, and other [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 13,856	$ 11,363
Machinery, equipment, and other [Member] \| 1 through 5 Years [Member]
Property, plant and equipment useful lives and total depreciated percentages [Abstract]
Ratio of depreciation by useful asset life over total depreciation of asset (in hundredths)	19.00%	19.00%
Machinery, equipment, and other [Member] \| 6 through 10 Years [Member]
Property, plant and equipment useful lives and total depreciated percentages [Abstract]
Ratio of depreciation by useful asset life over total depreciation of asset (in hundredths)	75.00%	74.00%
Machinery, equipment, and other [Member] \| 11 through 20 Years [Member]
Property, plant and equipment useful lives and total depreciated percentages [Abstract]
Ratio of depreciation by useful asset life over total depreciation of asset (in hundredths)	6.00%	7.00%

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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