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Share capital - Rio Tinto plc - Additional information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Shares and ADRs      
Disclosure of classes of share capital [line items]      
Value of shares purchased by employee share ownership trusts $ 18 $ 31 $ 43
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) 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 46,977