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Close-down and restoration provisions - Additional information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2023
Dec. 31, 2022
USD ($)
Disclosure of other provisions [Line Items]        
Discount rate used to measure liabilities 0.020     0.015
Average period of underlying cash flows (in years) 30 years      
Remaining lives of operations and infrastructure present closure obligation 14 years      
Provisions $ 1,558 $ 2,492   $ 1,658
Bottom of range        
Disclosure of other provisions [Line Items]        
Remaining lives of operations and infrastructure one      
Top of range        
Disclosure of other provisions [Line Items]        
Remaining lives of operations and infrastructure 50 years      
Restructuring provision        
Disclosure of other provisions [Line Items]        
Decreasing provision $ 700      
Close down and restoration/ environmental        
Disclosure of other provisions [Line Items]        
Provisions 17,150 14,542   $ 15,759
Closure discount rate     0.020 0.015
Kennecott        
Disclosure of other provisions [Line Items]        
Environmental loss contingencies, gross 700      
Ranger Uranium Mine        
Disclosure of other provisions [Line Items]        
Closure liabilities $ 850 $ 510