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Close-down, restoration and environmental provisions - Additional information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Jun. 30, 2024
Dec. 31, 2023
USD ($)
Jun. 30, 2023
Dec. 31, 2022
USD ($)
Jun. 30, 2022
Disclosure of other provisions [Line Items]            
Average period of underlying cash flows (in years) 30 years          
Remaining lives of operations and infrastructure present closure obligation 14 years          
Provisions $ 1,456   $ 1,558   $ 1,658  
Bottom of range            
Disclosure of other provisions [Line Items]            
Remaining lives of operations and infrastructure 1 year          
Top of range            
Disclosure of other provisions [Line Items]            
Remaining lives of operations and infrastructure 50 years          
Ranger Uranium Mine            
Disclosure of other provisions [Line Items]            
Closure liabilities $ 850          
Kennecott            
Disclosure of other provisions [Line Items]            
Environmental loss contingencies, gross $ 700          
Close down and restoration/ environmental            
Disclosure of other provisions [Line Items]            
Closure discount rate 0.025 0.025 0.020 0.020   0.015
Provisions $ 15,731   $ 17,150   $ 15,759  
Restructuring provision            
Disclosure of other provisions [Line Items]            
Decreasing provision $ 500