Reconciliations of capital expenditures (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reconciliation of Capital expenditures
Capital expenditures	$ 450	$ 678	$ 998	$ 1,225
Reportable Segments
Reconciliation of Capital expenditures
Capital expenditures	464	655	835	1,050
All Other operating segments
Reconciliation of Capital expenditures
Capital expenditures	23	22	38	35
Cost Centers
Reconciliation of Capital expenditures
Capital expenditures	6	29	15	49
Timing
Reconciliation of Capital expenditures
Capital expenditures	(14)	(5)	146	129
Other
Reconciliation of Capital expenditures
Capital expenditures	(29)	(23)	(36)	(38)
Construction Industries | Reportable Segments
Reconciliation of Capital expenditures
Capital expenditures	28	41	48	69
Resource Industries | Reportable Segments
Reconciliation of Capital expenditures
Capital expenditures	36	37	53	60
Energy & Transportation | Reportable Segments
Reconciliation of Capital expenditures
Capital expenditures	144	118	231	216
Financial Products Segment | Reportable Segments
Reconciliation of Capital expenditures
Capital expenditures	$ 256	$ 459	$ 503	$ 705