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Events after the balance sheet date (Tables)
12 Months Ended
Dec. 31, 2021
Disclosure of non-adjusting events after reporting period [abstract]  
Summary of reallocation of net assets value
Retained earnings
US$m
Non-controlling interests
US$m
Change in equity interest held by Rio Tinto(490)490 
Equity issued to owners of non-controlling interests(711)711