Sales and revenue recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Trade receivables	$ 7,864	$ 7,923	$ 7,551
Long-term trade receivables	640	589	506
Contract assets	238	246	247
Contract liabilities	2,745	2,389	$ 2,314
Revenue	1,591	$ 1,660
Performance obligations	$ 15,200
Period after which collection of future income is not probable	120 days
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction	12 months
Remaining performance obligation percentage	50.00%