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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, 2019
£ / shares
Dec. 31, 2019
$ / shares
Dec. 31, 2018
£ / shares
Dec. 31, 2018
$ / shares
Management share plans, bonus deferral plans, global employee share plans and uk share plan (combined) [member] | Rio Tinto plc [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 3,042,020 3,042,020 3,473,092 3,473,092
Number of non-vested shares, awarded 1,043,817 1,043,817 1,135,103 1,135,103
Number of non-vested shares, forfeited (224,402) (224,402) (250,853) (250,853)
Number of non-vested shares, Cancelled (24,043) (24,043) (33,563) (33,563)
Number of non-vested shares, vested (1,224,379) (1,224,379) (1,281,759) (1,281,759)
Number of non-vested shares at ending balance 2,613,013 2,613,013 3,042,020 3,042,020
Weighted average fair value at grant date, non-vested shares at beginning balance £ 31.43   £ 27.23  
Weighted average fair value at grant date, non-vested shares, awarded 40.41   39.49  
Weighted average fair value at grant date, non-vested shares, forfeited 39.46   30.26  
Weighted average fair value at grant date, non-vested shares, cancelled 32.87   26.52  
Weighted average fair value at grant date, non-vested shares, vested 25.40   27.54  
Weighted average fair value at grant date, non-vested shares ending balance £ 37.14   £ 31.43  
Management share plans, bonus deferral plans, global employee share plans and uk share plan (combined) [member] | Rio Tinto Limited [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 2,613,930 2,613,930 2,933,237 2,933,237
Number of non-vested shares, awarded 846,008 846,008 943,315 943,315
Number of non-vested shares, forfeited (174,025) (174,025) (185,062) (185,062)
Number of non-vested shares, Cancelled (35,481) (35,481) (36,613) (36,613)
Number of non-vested shares, vested (976,763) (976,763) (1,040,947) (1,040,947)
Number of non-vested shares at ending balance 2,273,669 2,273,669 2,613,930 2,613,930
Weighted average fair value at grant date, non-vested shares at beginning balance | $ / shares   $ 61.71   $ 54.15
Weighted average fair value at grant date, non-vested shares, awarded | $ / shares   86.56   78.36
Weighted average fair value at grant date, non-vested shares, forfeited | $ / shares   72.18   64.60
Weighted average fair value at grant date, non-vested shares, cancelled | $ / shares   60.91   52.84
Weighted average fair value at grant date, non-vested shares, vested | $ / shares   49.39   55.30
Weighted average fair value at grant date, non-vested shares ending balance | $ / shares   $ 75.46   $ 61.71
Management share plans [member] | Rio Tinto plc [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 1,666,082 1,666,082    
Number of non-vested shares at ending balance 1,398,039 1,398,039 1,666,082 1,666,082
Weighted average fair value at grant date, non-vested shares at beginning balance £ 32.52      
Weighted average fair value at grant date, non-vested shares ending balance £ 38.68   £ 32.52  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 681,242 681,242 669,678 669,678
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) £ 43.68   £ 40.03  
Management share plans [member] | Rio Tinto Limited [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 1,520,292 1,520,292    
Number of non-vested shares at ending balance 1,363,601 1,363,601 1,520,292 1,520,292
Weighted average fair value at grant date, non-vested shares at beginning balance | $ / shares   $ 64.06    
Weighted average fair value at grant date, non-vested shares ending balance | $ / shares   $ 78.67   $ 64.06
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 582,948 582,948 570,173 570,173
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 93.05   $ 80.87
Bonus deferral plans [member] | Rio Tinto plc [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 203,900 203,900    
Number of non-vested shares at ending balance 192,878 192,878 203,900 203,900
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 £ 41.95   £ 37.86  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 163,076 163,076 221,198 221,198
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) £ 42.53   £ 37.69  
Bonus deferral plans [member] | Rio Tinto Limited [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 127,423 127,423    
Number of non-vested shares at ending balance 87,930 87,930 127,423 127,423
Weighted average fair value at grant date, non-vested shares at beginning balance | $ / shares   $ 71.93    
Weighted average fair value at grant date, non-vested shares ending balance | $ / shares   $ 87.81   $ 71.93
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 85,142 85,142 108,001 108,001
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 97.30   $ 75.36
Global employee share plans [member] | Rio Tinto plc [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 1,102,322 1,102,322    
Number of non-vested shares at ending balance 982,932 982,932 1,102,322 1,102,322
Weighted average fair value at grant date, non-vested shares at beginning balance £ 28.68      
Weighted average fair value at grant date, non-vested shares ending balance £ 33.98   £ 28.68  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 543,426 543,426 451,710 451,710
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) £ 43.04   £ 39.06  
Global employee share plans [member] | Rio Tinto Limited [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 966,215 966,215    
Number of non-vested shares at ending balance 822,138 822,138 966,215 966,215
Weighted average fair value at grant date, non-vested shares at beginning balance | $ / shares   $ 56.66    
Weighted average fair value at grant date, non-vested shares ending balance | $ / shares   $ 68.82   $ 56.66
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 421,614 421,614 473,420 473,420
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 91.50   $ 78.78
UK share plan [member] | Rio Tinto plc [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares at beginning balance 69,716 69,716    
Number of non-vested shares at ending balance 39,164 39,164 69,716 69,716
Weighted average fair value at grant date, non-vested shares at beginning balance £ 29.90      
Weighted average fair value at grant date, non-vested shares ending balance £ 37.86   £ 29.90  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) 34,196 34,196 16,968 16,968
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) £ 42.21   £ 38.21