Property, Plant, and Equipment (Details) (USD $) In Millions, unless otherwise specified																							12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Land	Dec. 31, 2011 Land	Dec. 31, 2012 Buildings and property improvements	Dec. 31, 2011 Buildings and property improvements	Dec. 31, 2012 Buildings and property improvements 1 - 10 years	Dec. 31, 2011 Buildings and property improvements 1 - 10 years	Dec. 31, 2012 Buildings and property improvements 11 - 20 years	Dec. 31, 2011 Buildings and property improvements 11 - 20 years	Dec. 31, 2012 Buildings and property improvements 21 - 30 years	Dec. 31, 2011 Buildings and property improvements 21 - 30 years	Dec. 31, 2012 Buildings and property improvements 31 - 40 years	Dec. 31, 2011 Buildings and property improvements 31 - 40 years	Dec. 31, 2012 Machinery, equipment, and other	Dec. 31, 2011 Machinery, equipment, and other	Dec. 31, 2012 Machinery, equipment, and other 1 - 5 years	Dec. 31, 2011 Machinery, equipment, and other 1 - 5 years	Dec. 31, 2012 Machinery, equipment, and other 6 - 10 years	Dec. 31, 2011 Machinery, equipment, and other 6 - 10 years	Dec. 31, 2012 Machinery, equipment, and other 11 - 20 years	Dec. 31, 2011 Machinery, equipment, and other 11 - 20 years	Dec. 31, 2012 Minimum Buildings and property improvements 1 - 5 years	Dec. 31, 2012 Minimum Buildings and property improvements 6 - 10 years	Dec. 31, 2012 Minimum Buildings and property improvements 1 - 10 years	Dec. 31, 2012 Minimum Buildings and property improvements 11 - 20 years	Dec. 31, 2012 Minimum Buildings and property improvements 21 - 30 years	Dec. 31, 2012 Minimum Buildings and property improvements 31 - 40 years	Dec. 31, 2012 Maximum Buildings and property improvements 1 - 5 years	Dec. 31, 2012 Maximum Buildings and property improvements 6 - 10 years	Dec. 31, 2012 Maximum Buildings and property improvements 1 - 10 years	Dec. 31, 2012 Maximum Buildings and property improvements 11 - 20 years	Dec. 31, 2012 Maximum Buildings and property improvements 21 - 30 years	Dec. 31, 2012 Maximum Buildings and property improvements 31 - 40 years
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 18,313	$ 15,588	$ 145	$ 123	$ 1,861	$ 1,609									$ 16,307	$ 13,856
Accumulated depreciation	8,056	7,096
Net property, plant, and equipment	$ 10,257	$ 8,492
Property, plant, and equipment useful lives																							1 year	6 years	1 year	11 years	21 years	31 years	5 years	10 years	10 years	20 years	30 years	40 years
Property Plant Equipment Useful Lives Total Depreciated Percentages [Abstract]
Ratio of depreciation by useful asset life over total depreciation of asset (in hundredths)							14.00%	13.00%	46.00%	47.00%	14.00%	13.00%	26.00%	27.00%			20.00%	19.00%	74.00%	75.00%	6.00%	6.00%