Segment Information (Details 3) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues	$ 13,510	$ 11,413	$ 40,380	$ 32,566
Reportable Segments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues	13,614	11,459	40,661	32,742
All Other operating segments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		56		126
Other
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		(102)		(302)
Machinery, Energy & Transportation | Reportable Segments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues	12,769	10,685	38,194	30,432
Financial Products
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues	$ 747		$ 2,188
Business | Machinery, Energy & Transportation
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		10,713		30,482
Business | Machinery, Energy & Transportation | Reportable Segments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		10,685		30,432
Business | Machinery, Energy & Transportation | All Other operating segments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		56		126
Business | Machinery, Energy & Transportation | Other
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		(28)		(76)
Business | Financial Products
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		793		2,363
Business | Financial Products | Reportable Segments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		774		2,310
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		19		53
Consolidating Adjustments
Reconciliation of Consolidated profit (loss) before taxes
Total sales and revenues		(93)		(279)
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		$ (93)		$ (279)