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Share-based payments - Summary of performance share plans (Detail) - Performance share plans
 12 Months Ended
Dec. 31, 2020
shares
£ / shares
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
£ / shares
Dec. 31, 2019
shares
$ / shares
Rio Tinto plc        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 3,803,394 3,803,394 3,845,082 3,845,082
Number of non-vested shares, awarded 716,111 716,111 755,735 755,735
Number of non-vested shares, forfeited (136,030) (136,030) (122,961) (122,961)
Number of non-vested shares, failed performance conditions (145,661) (145,661) (384,130) (384,130)
Number of non-vested shares, vested (459,773) (459,773) (290,332) (290,332)
Number of non-vested shares at ending balance 3,778,041 3,778,041 3,803,394 3,803,394
Weighted average fair value at grant date, non-vested shares at beginning balance | £ / shares £ 22.20   £ 21.86  
Weighted average fair value at grant date, non-vested shares, awarded | £ / shares 13.55   24.68  
Weighted average fair value at grant date, non-vested shares, forfeited | £ / shares 21.13   23.95  
Weighted average fair value at grant date, non-vested shares, failed performance conditions | £ / shares 16.64   23.79  
Weighted average fair value at grant date, non-vested shares, vested | £ / shares 20.55   21.36  
Weighted average fair value at grant date, non-vested shares ending balance | £ / shares £ 21.01   £ 22.20  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 476,602 476,602 339,821 339,821
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) 108,887 108,887 1,279 1,279
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) | £ / shares £ 43.13   £ 45.52  
Weighted average share price, Vested awards settled in cash during the year (including dividend shares applied on vesting) | £ / shares £ 43.13   £ 43.65  
Rio Tinto Limited        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 1,636,517 1,636,517 1,797,279 1,797,279
Number of non-vested shares, awarded 198,863 198,863 297,189 297,189
Number of non-vested shares, forfeited (178,921) (178,921) (126,775) (126,775)
Number of non-vested shares, failed performance conditions (63,852) (63,852) (188,956) (188,956)
Number of non-vested shares, vested (201,234) (201,234) (142,220) (142,220)
Number of non-vested shares at ending balance 1,391,373 1,391,373 1,636,517 1,636,517
Weighted average fair value at grant date, non-vested shares at beginning balance | $ / shares   $ 45.11   $ 43.34
Weighted average fair value at grant date, non-vested shares, awarded | $ / shares   33.56   54.55
Weighted average fair value at grant date, non-vested shares, forfeited | $ / shares   46.37   44.02
Weighted average fair value at grant date, non-vested shares, failed performance conditions | $ / shares   33.38   46.42
Weighted average fair value at grant date, non-vested shares, vested | $ / shares   41.21   41.72
Weighted average fair value at grant date, non-vested shares ending balance | $ / shares   $ 44.40   $ 45.11
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 217,287 217,287 151,607 151,607
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) 28,208 28,208 1,347 1,347
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 93.48   $ 100.30
Weighted average share price, Vested awards settled in cash during the year (including dividend shares applied on vesting) | $ / shares   $ 93.82   $ 92.97