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Share-based payments - Management Share Plans, Bonus Deferral Plans, Global Employee Share Plans and UK Share Plan (combined) (Detail)
 12 Months Ended
Dec. 31, 2021
t
£ / shares
Dec. 31, 2021
t
$ / shares
Dec. 31, 2020
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£ / shares
Dec. 31, 2020
t
$ / shares
Share incentive plan | Rio Tinto plc        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares, beginning balance 2,650,861 2,650,861 2,613,013 2,613,013
Number of non-vested shares, awarded 987,665 987,665 1,190,528 1,190,528
Number of non-vested shares, forfeited (202,248) (202,248) (99,038) (99,038)
Number of non-vested shares, Cancelled (42,812) (42,812) (33,955) (33,955)
Number of non-vested shares, vested (899,640) (899,640) (1,019,687) (1,019,687)
Number of non-vested shares, ending balance 2,493,826 2,493,826 2,650,861 2,650,861
Weighted average fair value at grant date, non-vested shares, beginning balance £ 37.50   £ 37.14  
Weighted average fair value at grant date, non-vested shares, awarded 52.07   36.27  
Weighted average fair value at grant date, non-vested shares, forfeited 23.84   44.42  
Weighted average fair value at grant date, non-vested shares, cancelled 45.09   37.72  
Weighted average fair value at grant date, non-vested shares, vested 39.44   34.46  
Weighted average fair value at grant date, non-vested shares, ending balance £ 43.55   £ 37.50  
Share incentive plan | Rio Tinto Limited        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares, beginning balance 2,216,734 2,216,734 2,273,669 2,273,669
Number of non-vested shares, awarded 887,022 887,022 921,070 921,070
Number of non-vested shares, forfeited (130,990) (130,990) (60,935) (60,935)
Number of non-vested shares, Cancelled (46,624) (46,624) (50,354) (50,354)
Number of non-vested shares, vested (761,574) (761,574) (866,716) (866,716)
Number of non-vested shares, ending balance 2,164,568 2,164,568 2,216,734 2,216,734
Weighted average fair value at grant date, non-vested shares, beginning balance | $ / shares   $ 82.52   $ 75.46
Weighted average fair value at grant date, non-vested shares, awarded | $ / shares   105.47   83.20
Weighted average fair value at grant date, non-vested shares, forfeited | $ / shares   90.01   85.01
Weighted average fair value at grant date, non-vested shares, cancelled | $ / shares   87.08   71.45
Weighted average fair value at grant date, non-vested shares, vested | $ / shares   79.86   65.19
Weighted average fair value at grant date, non-vested shares, ending balance | $ / shares   $ 92.31   $ 82.52
– Management Share Awards | Rio Tinto plc        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares, beginning balance 1,352,759 1,352,759    
Number of non-vested shares, ending balance 1,241,695 1,241,695 1,352,759 1,352,759
Weighted average fair value at grant date, non-vested shares, beginning balance £ 38.73      
Weighted average fair value at grant date, non-vested shares, ending balance £ 43.63   £ 38.73  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 547,487 547,487 707,133 707,133
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) £ 60.74   £ 42.26  
– Management Share Awards | Rio Tinto Limited        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares, beginning balance 1,291,203 1,291,203    
Number of non-vested shares, ending balance 1,178,538 1,178,538 1,291,203 1,291,203
Weighted average fair value at grant date, non-vested shares, beginning balance | $ / shares   $ 85.80    
Weighted average fair value at grant date, non-vested shares, ending balance | $ / shares   $ 95.70   $ 85.80
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 550,161 550,161 640,948 640,948
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 122.89   $ 97.74
– Bonus Deferral Awards | Rio Tinto plc        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares, beginning balance 211,905 211,905    
Number of non-vested shares, ending balance 158,572 158,572 211,905 211,905
Weighted average fair value at grant date, non-vested shares, beginning balance £ 36.14      
Weighted average fair value at grant date, non-vested shares, ending balance £ 42.31   £ 36.14  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 100,368 100,368 111,233 111,233
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) £ 47.96   £ 49.71  
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) | t 23,371 23,371 19,617 19,617
Weighted average share price, vested awards settled in cash during the year (including dividend shares applied on vesting) £ 46.12   £ 48.34  
– Bonus Deferral Awards | Rio Tinto Limited        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares, beginning balance 53,324 53,324    
Number of non-vested shares, ending balance 46,660 46,660 53,324 53,324
Weighted average fair value at grant date, non-vested shares, beginning balance | $ / shares   $ 85.53    
Weighted average fair value at grant date, non-vested shares, ending balance | $ / shares   $ 96.08   $ 85.53
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 34,279 34,279 63,404 63,404
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 105.55   $ 101.96
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) | t 19,607 19,607 0 0
Weighted average share price, vested awards settled in cash during the year (including dividend shares applied on vesting) £ 93.5   £ 0  
– Global Employee Share Plan | Rio Tinto plc        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares, beginning balance 1,050,608 1,050,608    
Number of non-vested shares, ending balance 1,060,394 1,060,394 1,050,608 1,050,608
Weighted average fair value at grant date, non-vested shares, beginning balance £ 36.06      
Weighted average fair value at grant date, non-vested shares, ending balance £ 43.49   £ 36.06  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 407,314 407,314 401,169 401,169
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) £ 54.61   £ 43.82  
– Global Employee Share Plan | Rio Tinto Limited        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares, beginning balance 872,207 872,207    
Number of non-vested shares, ending balance 939,370 939,370 872,207 872,207
Weighted average fair value at grant date, non-vested shares, beginning balance | $ / shares   $ 77.47    
Weighted average fair value at grant date, non-vested shares, ending balance | $ / shares   $ 87.86   $ 77.47
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 312,109 312,109 299,381 299,381
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 112.33   $ 98.60
– UK Share Plan | Rio Tinto plc        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares, beginning balance 35,589 35,589    
Number of non-vested shares, ending balance 33,165 33,165 35,589 35,589
Weighted average fair value at grant date, non-vested shares, beginning balance £ 41.54      
Weighted average fair value at grant date, non-vested shares, ending balance £ 47.94   £ 41.54  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 20,111 20,111 2,392 2,392
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) £ 57.15   £ 45.73  
– UK Share Plan | Rio Tinto Limited        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares, beginning balance 0 0    
Number of non-vested shares, ending balance 0 0 0 0
Weighted average fair value at grant date, non-vested shares, beginning balance £ 0      
Weighted average fair value at grant date, non-vested shares, ending balance £ 0   £ 0  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 0 0 0 0
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) £ 0   £ 0