Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Revenue Reconciling Item
Sales and revenues	$ 16,445	$ 15,716	$ 49,800	$ 42,895
Machinery and Power Systems
Segment Reporting Revenue Reconciling Item
Sales and revenues	15,739	15,023	47,711	40,835
Financial Products
Segment Reporting Revenue Reconciling Item
Sales and revenues	796	774	2,353	2,291
Consolidating Adjustments
Segment Reporting Revenue Reconciling Item
Sales and revenues	(90)	(81)	(264)	(231)
Reportable segments
Segment Reporting Revenue Reconciling Item
Sales and revenues	16,211	15,331	48,804	41,578
Reportable segments | Machinery and Power Systems
Segment Reporting Revenue Reconciling Item
Sales and revenues	15,435	14,574	46,503	39,327
Reportable segments | Financial Products
Segment Reporting Revenue Reconciling Item
Sales and revenues	776	757	2,301	2,251
Reportable segments | Consolidating Adjustments
Segment Reporting Revenue Reconciling Item
Sales and revenues	0	0	0	0
All other operating segment
Segment Reporting Revenue Reconciling Item
Sales and revenues	318	461	1,246	1,525
All other operating segment | Machinery and Power Systems
Segment Reporting Revenue Reconciling Item
Sales and revenues	318	461	1,246	1,525
All other operating segment | Financial Products
Segment Reporting Revenue Reconciling Item
Sales and revenues	0	0	0	0
All other operating segment | Consolidating Adjustments
Segment Reporting Revenue Reconciling Item
Sales and revenues	0	0	0	0
Other
Segment Reporting Revenue Reconciling Item
Sales and revenues	(84)	(76)	(250)	(208)
Other | Machinery and Power Systems
Segment Reporting Revenue Reconciling Item
Sales and revenues	(14)	(12)	(38)	(17)
Other | Financial Products
Segment Reporting Revenue Reconciling Item
Sales and revenues	20	17	52	40
Other | Consolidating Adjustments
Segment Reporting Revenue Reconciling Item
Sales and revenues	$ (90)	$ (81)	$ (264)	$ (231)