Restructuring income/costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Loss on divestiture		$ 586
(Gains) losses reclassified to earnings		494
Restructuring costs	$ 359	$ 780	$ 299
Rail
Restructuring Cost and Reserve [Line Items]
Restructuring costs			$ 193