Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Reconciliation of Sales and revenues
Sales and revenues	$ 12,702	$ 13,241
Reportable Segments
Reconciliation of Sales and revenues
Sales and revenues	12,180	12,780
All Other operating segments
Reconciliation of Sales and revenues
Sales and revenues	586	554
Other
Reconciliation of Sales and revenues
Sales and revenues	(64)	(93)
Consolidating Adjustments
Reconciliation of Sales and revenues
Sales and revenues	(72)	(83)
Consolidating Adjustments | Reportable Segments
Reconciliation of Sales and revenues
Sales and revenues	0	0
Consolidating Adjustments | All Other operating segments
Reconciliation of Sales and revenues
Sales and revenues	0	0
Consolidating Adjustments | Other
Reconciliation of Sales and revenues
Sales and revenues	(72)	(83)
Machinery, Energy & Transportation | Reportable Segments
Reconciliation of Sales and revenues
Sales and revenues	11,385	11,963
Machinery, Energy & Transportation | Business
Reconciliation of Sales and revenues
Sales and revenues	11,961	12,493
Machinery, Energy & Transportation | Business | Reportable Segments
Reconciliation of Sales and revenues
Sales and revenues	11,385	11,963
Machinery, Energy & Transportation | Business | All Other operating segments
Reconciliation of Sales and revenues
Sales and revenues	586	554
Machinery, Energy & Transportation | Business | Other
Reconciliation of Sales and revenues
Sales and revenues	(10)	(24)
Financial Products | Business
Reconciliation of Sales and revenues
Sales and revenues	813	831
Financial Products | Business | Reportable Segments
Reconciliation of Sales and revenues
Sales and revenues	795	817
Financial Products | Business | All Other operating segments
Reconciliation of Sales and revenues
Sales and revenues	0	0
Financial Products | Business | Other
Reconciliation of Sales and revenues
Sales and revenues	$ 18	$ 14