Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Revenue Reconciling Item
Sales and revenues	$ 17,374	$ 14,230	$ 33,355	$ 27,179
Machinery and Power Systems
Segment Reporting Revenue Reconciling Item
Sales and revenues	16,684	13,535	31,972	25,812
Financial Products
Segment Reporting Revenue Reconciling Item
Sales and revenues	780	777	1,557	1,517
Consolidating Adjustments
Segment Reporting Revenue Reconciling Item
Sales and revenues	(90)	(82)	(174)	(150)
Reportable segments
Segment Reporting Revenue Reconciling Item
Sales and revenues	17,005	13,829	32,593	26,247
Reportable segments | Machinery and Power Systems
Segment Reporting Revenue Reconciling Item
Sales and revenues	16,241	13,065	31,068	24,753
Reportable segments | Financial Products
Segment Reporting Revenue Reconciling Item
Sales and revenues	764	764	1,525	1,494
Reportable segments | Consolidating Adjustments
Segment Reporting Revenue Reconciling Item
Sales and revenues	0	0	0	0
All other operating segments
Segment Reporting Revenue Reconciling Item
Sales and revenues	454	475	928	1,064
All other operating segments | Machinery and Power Systems
Segment Reporting Revenue Reconciling Item
Sales and revenues	454	475	928	1,064
All other operating segments | Financial Products
Segment Reporting Revenue Reconciling Item
Sales and revenues	0	0	0	0
All other operating segments | Consolidating Adjustments
Segment Reporting Revenue Reconciling Item
Sales and revenues	0	0	0	0
Other
Segment Reporting Revenue Reconciling Item
Sales and revenues	(85)	(74)	(166)	(132)
Other | Machinery and Power Systems
Segment Reporting Revenue Reconciling Item
Sales and revenues	(11)	(5)	(24)	(5)
Other | Financial Products
Segment Reporting Revenue Reconciling Item
Sales and revenues	16	13	32	23
Other | Consolidating Adjustments
Segment Reporting Revenue Reconciling Item
Sales and revenues	$ (90)	$ (82)	$ (174)	$ (150)