Segment Information (Details 3) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues	$ 14,011	$ 11,331	$ 26,870	$ 21,153
Reportable Segments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues	14,111	11,406	27,047	21,283
All Other operating segments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		33		70
Other
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		(108)		(200)
Machinery, Energy & Transportation | Reportable Segments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues	$ 13,282	10,630	$ 25,425	19,747
Business | Machinery, Energy & Transportation
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		10,639		19,769
Business | Machinery, Energy & Transportation | Reportable Segments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		10,630		19,747
Business | Machinery, Energy & Transportation | All Other operating segments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		33		70
Business | Machinery, Energy & Transportation | Other
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		(24)		(48)
Business | Financial Products
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		793		1,570
Business | Financial Products | Reportable Segments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		776		1,536
Business | Financial Products | All Other operating segments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		0		0
Business | Financial Products | Other
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		17		34
Consolidating Adjustments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		(101)		(186)
Consolidating Adjustments | Reportable Segments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		0		0
Consolidating Adjustments | All Other operating segments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		0		0
Consolidating Adjustments | Other
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		$ (101)		$ (186)