Property, plant and equipment, net - Schedule of Property, plant and equipment (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Finance lease right-of-use assets	$ 187	$ 128
Total property, plant and equipment	32,764	31,729
Less: accumulated depreciation, depletion, amortization and impairment	(14,923)	(13,961)
Total property, plant and equipment, net	17,841	17,768
Mineral-bearing land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	4,847	5,055
Land and buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment	5,991	5,851
Plant and machinery
Property, Plant and Equipment [Line Items]
Property, plant and equipment	20,468	19,605
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 1,271	$ 1,090