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Events after the balance sheet date (Details)
$ in Millions, $ in Millions
12 Months Ended
Jan. 15, 2024
USD ($)
Jan. 15, 2024
AUD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Disclosure of non-adjusting events after reporting period [line items]        
Disposals     $ 128 $ 46
Other disposals of assets | Leichhardt Industrials Group | Dampier Salt Limited        
Disclosure of non-adjusting events after reporting period [line items]        
Disposals $ 251 $ 375