Segment Information (Details 2) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Segment Reporting Revenue Reconciling Item
Sales and revenues	$ 15,716	$ 11,134	$ 42,895	$ 29,781
Machinery and Power Systems | Reportable segments
Segment Reporting Revenue Reconciling Item
Sales and revenues	14,574	9,924	39,327	26,202
Financial Products | Reportable segments
Segment Reporting Revenue Reconciling Item
Sales and revenues	757	737	2,251	2,220
Reportable segments
Segment Reporting Revenue Reconciling Item
Sales and revenues	15,331	10,661	41,578	28,422
Machinery and Power Systems | All other operating segments
Segment Reporting Revenue Reconciling Item
Sales and revenues	461	550	1,525	1,573
All other operating segments
Segment Reporting Revenue Reconciling Item
Sales and revenues	461	550	1,525	1,573
Machinery and Power Systems | Other
Segment Reporting Revenue Reconciling Item
Sales and revenues	(12)	(22)	(17)	(49)
Financial Products | Other
Segment Reporting Revenue Reconciling Item
Sales and revenues	17	12	40	28
Other
Segment Reporting Revenue Reconciling Item
Sales and revenues	(76)	(77)	(208)	(214)
Other | Consolidating Adjustments
Segment Reporting Revenue Reconciling Item
Sales and revenues	(81)	(67)	(231)	(193)
Machinery and Power Systems
Segment Reporting Revenue Reconciling Item
Sales and revenues	15,023	10,452	40,835	27,726
Financial Products
Segment Reporting Revenue Reconciling Item
Sales and revenues	774	749	2,291	2,248
Consolidating Adjustments
Segment Reporting Revenue Reconciling Item
Sales and revenues	$ (81)	$ (67)	$ (231)	$ (193)