Supplemental financial information - Property, plant and equipment at cost (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost	$ 15,254	$ 13,268
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost	113	150
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost	$ 6,424	5,549
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost, depreciable lives	40 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost	$ 8,717	$ 7,569
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost, depreciable lives	5 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost, depreciable lives	10 years