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Share capital - Rio Tinto plc - Additional information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Shares and ADRs      
Disclosure of classes of share capital [line items]      
Value of shares purchased by employee share ownership trusts $ 17 $ 16 $ 18
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) 253,371 232,621 259,583
Rio Tinto plc | ADRs      
Disclosure of classes of share capital [line items]      
American depository receipts in entity held in employee share ownership trust (in shares) 45,694 49,777 46,977