Supplemental financial information - Property, plant and equipment at cost (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost	$ 17,682	$ 15,254
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost	162	113
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment at cost	$ 6,830	6,424
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	$ 10,690	$ 8,717
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