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Share capital - Rio Tinto Limited - Summary of share capital (Detail)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
vote
shares
Dec. 31, 2023
USD ($)
vote
shares
Dec. 31, 2022
USD ($)
vote
shares
Disclosure of classes of share capital [line items]      
Adjustment on currency translation $ 193 $ 47 $ 42
– Rio Tinto Limited      
Disclosure of classes of share capital [line items]      
Number of issued and fully paid up share capital beginning balance (in shares) | shares 371,210 371,210 371,210
Number of issued and fully paid up share capital ending balance (in shares) | shares 371,210 371,210 371,210
Issued and fully paid up share capital beginning balance $ 3,377 $ 3,330 $ 3,570
Adjustment on currency translation (317) 47 (240)
Issued and fully paid up share capital ending balance $ 3,060 $ 3,377 $ 3,330
– Rio Tinto Limited | Special voting share      
Disclosure of classes of share capital [line items]      
Rights, Preferences And Restrictions Attaching To Class Of Share Capital, Votes | vote 1,000,000 1,000,000 1,000,000
– Rio Tinto Limited | DLC dividend share      
Disclosure of classes of share capital [line items]      
Rights, Preferences And Restrictions Attaching To Class Of Share Capital, Votes | vote 1,000,000 1,000,000 1,000,000