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Non-controlling interests material to the Group - Reallocation of net asset value (Details) - USD ($)
$ in Millions
 1 Months Ended 6 Months Ended
Jan. 25, 2022
Jan. 25, 2022
Jun. 30, 2022
Jun. 30, 2021
Disclosure of classes of share capital [line items]        
Change in equity interest held by Rio Tinto     $ 0 $ 0
Equity issued to holders of non-controlling interests     22 28
Retained earnings        
Disclosure of classes of share capital [line items]        
Change in equity interest held by Rio Tinto $ (490) $ 6 (484) 37
Equity issued to holders of non-controlling interests (711)   (711)  
Non-controlling interests        
Disclosure of classes of share capital [line items]        
Change in equity interest held by Rio Tinto 490 $ (6) 484 (37)
Equity issued to holders of non-controlling interests $ 711   733 $ 28
Non-controlling interests | Subsidiaries other than Turquoise Hill        
Disclosure of classes of share capital [line items]        
Equity issued to holders of non-controlling interests     $ 22