Reconciliations of capital expenditures (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reconciliation of Capital expenditures
Total capital expenditures	$ 548	$ 547
Reportable Segments
Reconciliation of Capital expenditures
Total capital expenditures	371	395
All Other operating segments
Reconciliation of Capital expenditures
Total capital expenditures	15	13
Cost Centers
Reconciliation of Capital expenditures
Total capital expenditures	9	20
Timing
Reconciliation of Capital expenditures
Total capital expenditures	160	134
Other
Reconciliation of Capital expenditures
Total capital expenditures	(7)	(15)
Consolidating Adjustments
Reconciliation of Capital expenditures
Total capital expenditures	(4)	(1)
Consolidating Adjustments | Reportable Segments
Reconciliation of Capital expenditures
Total capital expenditures	0	0
Consolidating Adjustments | All Other operating segments
Reconciliation of Capital expenditures
Total capital expenditures	0	0
Consolidating Adjustments | Cost Centers
Reconciliation of Capital expenditures
Total capital expenditures	0	0
Consolidating Adjustments | Timing
Reconciliation of Capital expenditures
Total capital expenditures	0	0
Consolidating Adjustments | Other
Reconciliation of Capital expenditures
Total capital expenditures	(4)	(1)
Machinery, Energy & Transportation | Reportable Segments
Reconciliation of Capital expenditures
Total capital expenditures	124	149
Machinery, Energy & Transportation | Operating Segments
Reconciliation of Capital expenditures
Total capital expenditures	302	297
Machinery, Energy & Transportation | Operating Segments | Reportable Segments
Reconciliation of Capital expenditures
Total capital expenditures	124	149
Machinery, Energy & Transportation | Operating Segments | All Other operating segments
Reconciliation of Capital expenditures
Total capital expenditures	15	13
Machinery, Energy & Transportation | Operating Segments | Cost Centers
Reconciliation of Capital expenditures
Total capital expenditures	9	20
Machinery, Energy & Transportation | Operating Segments | Timing
Reconciliation of Capital expenditures
Total capital expenditures	160	134
Machinery, Energy & Transportation | Operating Segments | Other
Reconciliation of Capital expenditures
Total capital expenditures	(6)	(19)
Financial Products | Operating Segments
Reconciliation of Capital expenditures
Total capital expenditures	250	251
Financial Products | Operating Segments | Reportable Segments
Reconciliation of Capital expenditures
Total capital expenditures	247	246
Financial Products | Operating Segments | All Other operating segments
Reconciliation of Capital expenditures
Total capital expenditures	0	0
Financial Products | Operating Segments | Cost Centers
Reconciliation of Capital expenditures
Total capital expenditures	0	0
Financial Products | Operating Segments | Timing
Reconciliation of Capital expenditures
Total capital expenditures	0	0
Financial Products | Operating Segments | Other
Reconciliation of Capital expenditures
Total capital expenditures	$ 3	$ 5