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Share capital - Rio Tinto plc - Additional information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
– Rio Tinto plc      
Disclosure of classes of share capital [line items]      
Shares held in the employee share ownership trusts on behalf of Rio Tinto plc (in shares) 229,749 253,371 232,621
Shares and ADRs      
Disclosure of classes of share capital [line items]      
Value of shares purchased by employee share ownership trusts $ 13 $ 17 $ 16
ADRs | – Rio Tinto plc      
Disclosure of classes of share capital [line items]      
American depository receipts in entity held in employee share ownership trust (in shares) 48,990 45,694 49,777