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Dividends - Summary of number of shares dividend distributed (Detail) - shares
shares in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Final Dividends | Rio Tinto plc      
Disclosure of Dividends [Line Items]      
Previous year dividend number of shares (in shares) 1,247.6 1,246.4 1,265.0
Interim dividend number of shares (in shares) 1,247.8 1,246.5 1,256.4
Final Dividends | Rio Tinto Limited      
Disclosure of Dividends [Line Items]      
Previous year dividend number of shares (in shares) 371.2 371.2 371.2
Interim dividend number of shares (in shares) 371.2 371.2 371.2
Special Dividends | Rio Tinto plc      
Disclosure of Dividends [Line Items]      
Previous year dividend number of shares (in shares) 1,247.6 1,246.4 1,265.0
Interim dividend number of shares (in shares) 1,247.8 1,246.5 1,256.4
Special Dividends | Rio Tinto Limited      
Disclosure of Dividends [Line Items]      
Previous year dividend number of shares (in shares) 371.2 371.2 371.2
Interim dividend number of shares (in shares) 371.2 371.2 371.2