Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment
Land	$ 193	$ 191
Buildings and improvements	1,998	1,605
Machinery, equipment and other	10,475	8,881
Subtotal	12,666	10,677
Less: Accumulated depreciation	5,251	4,367
Total	7,415	6,310	3,161
Depreciation Expense for Property, plant and equipment
Depreciation expense relating to property, plant and equipment	$ 1,221	$ 991	$ 680
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Useful life, minimum	5
Useful life, maximum	30
Machinery, equipment and other [Member]
Property, Plant and Equipment [Line Items]
Useful life, minimum	1
Useful life, maximum	20