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Close-down and restoration provisions - Sensitivity analysis on provisions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
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 $ (168) $ 0
Discount rate decreased to 1.0% | Close down and restoration/ environmental    
Disclosure of other provisions [Line Items]    
Capitalised within "Property, plant and equipment" 2,300 1,400
Charged/(credited) to the income statement 300 100
Total increase/(decrease) in provision 2,600 1,500
Discount rate increased to 3.0% | Close down and restoration/ environmental    
Disclosure of other provisions [Line Items]    
Capitalised within "Property, plant and equipment" (1,800) 2,700
Charged/(credited) to the income statement (300) 300
Total increase/(decrease) in provision $ (2,100) $ 3,000