Reconciliations of depreciation and amortization (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reconciliation of Depreciation and amortization
Depreciation and amortization	$ 586	$ 614
Operating Segments | Reportable Segments
Reconciliation of Depreciation and amortization
Depreciation and amortization	496	515
Operating Segments | Reportable Segments | Construction Industries
Reconciliation of Depreciation and amortization
Depreciation and amortization	59	61
Operating Segments | Reportable Segments | Resource Industries
Reconciliation of Depreciation and amortization
Depreciation and amortization	99	103
Operating Segments | Reportable Segments | Energy & Transportation
Reconciliation of Depreciation and amortization
Depreciation and amortization	142	146
Operating Segments | Reportable Segments | Financial Products Segment
Reconciliation of Depreciation and amortization
Depreciation and amortization	196	205
Intersegment Eliminations | All Other operating segments
Reconciliation of Depreciation and amortization
Depreciation and amortization	62	62
Intersegment Eliminations | Cost Centers
Reconciliation of Depreciation and amortization
Depreciation and amortization	26	33
Intersegment Eliminations | Other
Reconciliation of Depreciation and amortization
Depreciation and amortization	$ 2	$ 4