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Close-down, restoration and environmental provisions - Sensitivity analysis on provisions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Bottom of range    
Disclosure of other provisions [Line Items]    
Risk free interest rate on provisions 1.00%  
Top of range    
Disclosure of other provisions [Line Items]    
Risk free interest rate on provisions 3.00%  
Close down and restoration/ environmental    
Disclosure of other provisions [Line Items]    
Total increase/(decrease) in provision $ (235) $ (168)
Discount rate decreased to 1.0% | Close down and restoration/ environmental    
Disclosure of other provisions [Line Items]    
Capitalised within "Property, plant and equipment" 3,300 2,300
Charged/(credited) to the income statement 400 300
Total increase/(decrease) in provision 3,700 2,600
Discount rate increased to 3.0% | Close down and restoration/ environmental    
Disclosure of other provisions [Line Items]    
Capitalised within "Property, plant and equipment" (900) (1,800)
Charged/(credited) to the income statement (100) (300)
Total increase/(decrease) in provision $ (1,000) $ (2,100)