Divestitures and Assets held for sale (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Apr. 30, 2012 dealer	Mar. 31, 2012 transaction	Dec. 31, 2011
Assets
Inventory		$ 16,511	$ 14,544
Total current assets		40,209	38,128
Property, plant and equipment - net		14,571	14,395
Intangible assets		4,287	4,368
Goodwill		7,081	7,080
Goodwill		51
Bucyrus Distribution Business Divestiture
Disposal groups including discontinued operations
Number of transactions classified as held for sale		5
Costs incurred related to Bucyrus distribution business divestiture activities		31
Selling, general and administrative expenses		26
Other operating income		5
Assets
Receivables			25
Inventory		185	109
Total current assets		185	134
Property, plant and equipment - net		30	28
Intangible assets		220	186
Goodwill		347	296
Non-current assets held for sale		597	510
Inventory		65
Property, plant and equipment - net		23
Intangible assets		51
Goodwill		87
Total Assets		$ 226
Number of dealers committed to purchase divested business	2