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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, 2020
t
£ / shares
Dec. 31, 2020
t
$ / shares
Dec. 31, 2019
t
£ / shares
Dec. 31, 2019
t
$ / shares
Management share plans, bonus deferral plans, global employee share plans and uk share plan (combined) | Rio Tinto plc        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 2,613,013 2,613,013 3,042,020 3,042,020
Number of non-vested shares, awarded 1,190,528 1,190,528 1,043,817 1,043,817
Number of non-vested shares, forfeited (99,038) (99,038) (224,402) (224,402)
Number of non-vested shares, Cancelled (33,955) (33,955) (24,043) (24,043)
Number of non-vested shares, vested (1,019,687) (1,019,687) (1,224,379) (1,224,379)
Number of non-vested shares at ending balance 2,650,861 2,650,861 2,613,013 2,613,013
Weighted average fair value at grant date, non-vested shares at beginning balance £ 37.14   £ 31.43  
Weighted average fair value at grant date, non-vested shares, awarded 36.27   40.41  
Weighted average fair value at grant date, non-vested shares, forfeited 44.42   39.46  
Weighted average fair value at grant date, non-vested shares, cancelled 37.72   32.87  
Weighted average fair value at grant date, non-vested shares, vested 34.46   25.40  
Weighted average fair value at grant date, non-vested shares ending balance £ 37.50   £ 37.14  
Management share plans, bonus deferral plans, global employee share plans and uk share plan (combined) | Rio Tinto Limited        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 2,273,669 2,273,669 2,613,930 2,613,930
Number of non-vested shares, awarded 921,070 921,070 846,008 846,008
Number of non-vested shares, forfeited (60,935) (60,935) (174,025) (174,025)
Number of non-vested shares, Cancelled (50,354) (50,354) (35,481) (35,481)
Number of non-vested shares, vested (866,716) (866,716) (976,763) (976,763)
Number of non-vested shares at ending balance 2,216,734 2,216,734 2,273,669 2,273,669
Weighted average fair value at grant date, non-vested shares at beginning balance | $ / shares   $ 75.46   $ 61.71
Weighted average fair value at grant date, non-vested shares, awarded | $ / shares   83.20   86.56
Weighted average fair value at grant date, non-vested shares, forfeited | $ / shares   85.01   72.18
Weighted average fair value at grant date, non-vested shares, cancelled | $ / shares   71.45   60.91
Weighted average fair value at grant date, non-vested shares, vested | $ / shares   65.19   49.39
Weighted average fair value at grant date, non-vested shares ending balance | $ / shares   $ 82.52   $ 75.46
Management share plans | Rio Tinto plc        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 1,398,039 1,398,039    
Number of non-vested shares at ending balance 1,352,759 1,352,759 1,398,039 1,398,039
Weighted average fair value at grant date, non-vested shares at beginning balance £ 38.68      
Weighted average fair value at grant date, non-vested shares ending balance £ 38.73   £ 38.68  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 707,133 707,133 681,242 681,242
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) £ 42.26   £ 43.68  
Management share plans | Rio Tinto Limited        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 1,363,601 1,363,601    
Number of non-vested shares at ending balance 1,291,203 1,291,203 1,363,601 1,363,601
Weighted average fair value at grant date, non-vested shares at beginning balance | $ / shares   $ 78.67    
Weighted average fair value at grant date, non-vested shares ending balance | $ / shares   $ 85.80   $ 78.67
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 640,948 640,948 582,948 582,948
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 97.74   $ 93.05
Bonus deferral plans | Rio Tinto plc        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 192,878 192,878    
Number of non-vested shares at ending balance 211,905 211,905 192,878 192,878
Weighted average fair value at grant date, non-vested shares at beginning balance £ 41.95      
Weighted average fair value at grant date, non-vested shares ending balance £ 36.14   £ 41.95  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 111,233 111,233 163,076 163,076
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) £ 49.71   £ 42.53  
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) | t 19,617 19,617 0 0
Weighted average share price, Vested awards settled in cash during the year (including dividend shares applied on vesting) £ 48.34   £ 0  
Bonus deferral plans | Rio Tinto Limited        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 87,930 87,930    
Number of non-vested shares at ending balance 53,324 53,324 87,930 87,930
Weighted average fair value at grant date, non-vested shares at beginning balance | $ / shares   $ 87.81    
Weighted average fair value at grant date, non-vested shares ending balance | $ / shares   $ 85.53   $ 87.81
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 63,404 63,404 85,142 85,142
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 101.96   $ 97.30
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) | t 0 0 0 0
Weighted average share price, Vested awards settled in cash during the year (including dividend shares applied on vesting) £ 0   £ 0  
Global employee share plans | Rio Tinto plc        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 982,932 982,932    
Number of non-vested shares at ending balance 1,050,608 1,050,608 982,932 982,932
Weighted average fair value at grant date, non-vested shares at beginning balance £ 33.98      
Weighted average fair value at grant date, non-vested shares ending balance £ 36.06   £ 33.98  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 401,169 401,169 543,426 543,426
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) £ 43.82   £ 43.04  
Global employee share plans | Rio Tinto Limited        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 822,138 822,138    
Number of non-vested shares at ending balance 872,207 872,207 822,138 822,138
Weighted average fair value at grant date, non-vested shares at beginning balance | $ / shares   $ 68.82    
Weighted average fair value at grant date, non-vested shares ending balance | $ / shares   $ 77.47   $ 68.82
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 299,381 299,381 421,614 421,614
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 98.60   $ 91.50
UK share plan | Rio Tinto plc        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 39,164 39,164    
Number of non-vested shares at ending balance 35,589 35,589 39,164 39,164
Weighted average fair value at grant date, non-vested shares at beginning balance £ 37.86      
Weighted average fair value at grant date, non-vested shares ending balance £ 41.54   £ 37.86  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 2,392 2,392 34,196 34,196
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) £ 45.73   £ 42.21  
UK share plan | Rio Tinto Limited        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 0 0    
Number of non-vested shares at ending balance 0 0 0 0
Weighted average fair value at grant date, non-vested shares at 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