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Close-down and restoration provisions - Undiscounted close-down and environmental restoration obligation (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of other provisions [Line Items]    
Undiscounted close-down and environmental restoration obligations $ 23,372 $ 20,433
Impact of discounting (6,222) (4,674)
Total closure obligation 17,150 15,759
Australia    
Disclosure of other provisions [Line Items]    
Total closure obligation 9,187 7,983
USA    
Disclosure of other provisions [Line Items]    
Total closure obligation 4,682 4,680
Canada    
Disclosure of other provisions [Line Items]    
Total closure obligation 1,722 1,730
Other countries    
Disclosure of other provisions [Line Items]    
Total closure obligation 1,559 1,366
Decommissioning, decontamination and demolition    
Disclosure of other provisions [Line Items]    
Total closure obligation 3,591 3,386
Closure and rehabilitation earthworks    
Disclosure of other provisions [Line Items]    
Total closure obligation 4,609 4,760
Long-term water management costs    
Disclosure of other provisions [Line Items]    
Total closure obligation 1,236 1,092
Post closure monitoring and maintenance    
Disclosure of other provisions [Line Items]    
Total closure obligation 1,806 1,846
Indirect costs, owners' costs and contingency    
Disclosure of other provisions [Line Items]    
Total closure obligation 5,908 4,675
Operating sites    
Disclosure of other provisions [Line Items]    
Total closure obligation 12,021 11,598
Non-operating sites    
Disclosure of other provisions [Line Items]    
Total closure obligation 5,129 4,161
Due within 1 year    
Disclosure of other provisions [Line Items]    
Undiscounted close-down and environmental restoration obligations 1,523 1,142
Between 1 and 3 years    
Disclosure of other provisions [Line Items]    
Undiscounted close-down and environmental restoration obligations 2,365 1,986
Between 3 and 5 years    
Disclosure of other provisions [Line Items]    
Undiscounted close-down and environmental restoration obligations 2,005 1,426
Later than five years    
Disclosure of other provisions [Line Items]    
Undiscounted close-down and environmental restoration obligations $ 17,479 $ 15,879