Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Revenue Reconciling Item
Sales and revenues	$ 13,210	$ 15,981
Machinery and Power Systems
Segment Reporting Revenue Reconciling Item
Sales and revenues	12,484	15,288
Financial Products
Segment Reporting Revenue Reconciling Item
Sales and revenues	814	777
Consolidating Adjustments
Segment Reporting Revenue Reconciling Item
Sales and revenues	(88)	(84)
Reportable segments
Segment Reporting Revenue Reconciling Item
Sales and revenues	13,073	15,588
Reportable segments | Machinery and Power Systems
Segment Reporting Revenue Reconciling Item
Sales and revenues	12,278	14,827
Reportable segments | Financial Products
Segment Reporting Revenue Reconciling Item
Sales and revenues	795	761
Reportable segments | Consolidating Adjustments
Segment Reporting Revenue Reconciling Item
Sales and revenues	0	0
All other operating segment
Segment Reporting Revenue Reconciling Item
Sales and revenues	217	474
All other operating segment | Machinery and Power Systems
Segment Reporting Revenue Reconciling Item
Sales and revenues	217	474
All other operating segment | Financial Products
Segment Reporting Revenue Reconciling Item
Sales and revenues	0	0
All other operating segment | Consolidating Adjustments
Segment Reporting Revenue Reconciling Item
Sales and revenues	0	0
Other
Segment Reporting Revenue Reconciling Item
Sales and revenues	(80)	(81)
Other | Machinery and Power Systems
Segment Reporting Revenue Reconciling Item
Sales and revenues	(11)	(13)
Other | Financial Products
Segment Reporting Revenue Reconciling Item
Sales and revenues	19	16
Other | Consolidating Adjustments
Segment Reporting Revenue Reconciling Item
Sales and revenues	$ (88)	$ (84)