Property, plant and equipment, net - Schedule of Property, plant and equipment (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Finance lease right-of-use assets	$ 741	$ 376
Total property, plant and equipment	42,545	37,154
Less: accumulated depreciation, depletion, amortization and impairment	(17,608)	(15,702)
Total property, plant and equipment, net	24,937	21,452
Mineral-bearing land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	5,596	5,159
Land and buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment	7,392	6,609
Plant and machinery
Property, Plant and Equipment [Line Items]
Property, plant and equipment	25,842	23,047
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 2,974	$ 1,963