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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, 2024
shares
£ / shares
Dec. 31, 2024
shares
$ / shares
Dec. 31, 2023
shares
£ / shares
Dec. 31, 2023
shares
$ / 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 (in shares) 2,810,128 2,810,128 2,585,679 2,585,679
Number of non-vested shares, awarded (in shares) 1,360,676 1,360,676 1,298,578 1,298,578
Number of non-vested shares, forfeited (in shares) (115,973) (115,973) (113,473) (113,473)
Number of non-vested shares, cancelled (94,111) (94,111) (71,160) (71,160)
Number of non-vested shares, vested (in shares) (909,986) (909,986) (889,496) (889,496)
Number of non-vested shares, ending balance (in shares) 3,050,734 3,050,734 2,810,128 2,810,128
Weighted average fair value at grant date, non-vested shares, beginning balance | £ / shares £ 50.36   £ 47.22  
Weighted average fair value at grant date, non-vested shares, awarded | £ / shares 46.54   49.59  
Weighted average fair value at grant date, non-vested shares, forfeited | £ / shares 47.67   57.02  
Weighted average fair value at grant date, non-vested shares, cancelled | £ / shares 44.97   46.21  
Weighted average fair value at grant date, non-vested shares, vested | £ / shares 52.00   39.59  
Weighted average fair value at grant date, non-vested shares, ending balance | £ / shares £ 48.43   £ 50.36  
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 (in shares) 2,580,993 2,580,993 2,340,705 2,340,705
Number of non-vested shares, awarded (in shares) 1,189,754 1,189,754 1,159,498 1,159,498
Number of non-vested shares, forfeited (in shares) (152,069) (152,069) (144,531) (144,531)
Number of non-vested shares, cancelled (70,514) (70,514) (61,993) (61,993)
Number of non-vested shares, vested (in shares) (767,686) (767,686) (712,686) (712,686)
Number of non-vested shares, ending balance (in shares) 2,780,478 2,780,478 2,580,993 2,580,993
Weighted average fair value at grant date, non-vested shares, beginning balance | $ / shares   $ 103.11   $ 95.27
Weighted average fair value at grant date, non-vested shares, awarded | $ / shares   110.96   107.86
Weighted average fair value at grant date, non-vested shares, forfeited | $ / shares   106.75   102.40
Weighted average fair value at grant date, non-vested shares, cancelled | $ / shares   98.85   93.15
Weighted average fair value at grant date, non-vested shares, vested | $ / shares   105.79   86.09
Weighted average fair value at grant date, non-vested shares, ending balance | $ / shares   $ 105.64   $ 103.11
– 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 (in shares) 1,321,207 1,321,207    
Number of non-vested shares, ending balance (in shares) 1,337,860 1,337,860 1,321,207 1,321,207
Weighted average fair value at grant date, non-vested shares, beginning balance | £ / shares £ 54.05      
Weighted average fair value at grant date, non-vested shares, ending balance | £ / shares £ 52.10   £ 54.05  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 569,907 569,907 537,748 537,748
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | £ / shares £ 51.97   £ 57.86  
– 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 (in shares) 1,211,757 1,211,757    
Number of non-vested shares, ending balance (in shares) 1,228,291 1,228,291 1,211,757 1,211,757
Weighted average fair value at grant date, non-vested shares, beginning balance | $ / shares   $ 113.03    
Weighted average fair value at grant date, non-vested shares, ending balance | $ / shares   $ 115.71   $ 113.03
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 458,429 458,429 476,813 476,813
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 123.92   $ 121.87
– 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 (in shares) 102,388 102,388    
Number of non-vested shares, ending balance (in shares) 74,844 74,844 102,388 102,388
Weighted average fair value at grant date, non-vested shares, beginning balance | £ / shares £ 55.64      
Weighted average fair value at grant date, non-vested shares, ending balance | £ / shares £ 50.75   £ 55.64  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 90,422 90,422 87,475 87,475
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | £ / shares £ 50.18   £ 55.43  
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) (in shares) 0 0 0 0
Weighted average share price, vested awards settled in cash during the year (including dividend shares applied on vesting) | £ / shares £ 0   £ 0  
– 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 (in shares) 56,597 56,597    
Number of non-vested shares, ending balance (in shares) 39,652 39,652 56,597 56,597
Weighted average fair value at grant date, non-vested shares, beginning balance | $ / shares   $ 113.90    
Weighted average fair value at grant date, non-vested shares, ending balance | $ / shares   $ 117.82   $ 113.90
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 44,477 44,477 23,569 23,569
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 119.53   $ 123.91
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) (in shares) 0 0 0 0
Weighted average share price, vested awards settled in cash during the year (including dividend shares applied on vesting) | $ / shares   $ 0   $ 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 (in shares) 1,350,559 1,350,559    
Number of non-vested shares, ending balance (in shares) 1,593,851 1,593,851 1,350,559 1,350,559
Weighted average fair value at grant date, non-vested shares, beginning balance | £ / shares £ 46.22      
Weighted average fair value at grant date, non-vested shares, ending balance | £ / shares £ 45.11   £ 46.22  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 431,973 431,973 493,187 493,187
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | £ / shares £ 51.59   £ 55.05  
– 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 (in shares) 1,312,639 1,312,639    
Number of non-vested shares, ending balance (in shares) 1,512,535 1,512,535 1,312,639 1,312,639
Weighted average fair value at grant date, non-vested shares, beginning balance | $ / shares   $ 93.50    
Weighted average fair value at grant date, non-vested shares, ending balance | $ / shares   $ 97.14   $ 93.50
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 401,915 401,915 374,232 374,232
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 120.73   $ 118.12
– 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 (in shares) 35,974 35,974    
Number of non-vested shares, ending balance (in shares) 44,179 44,179 35,974 35,974
Weighted average fair value at grant date, non-vested shares, beginning balance | £ / shares £ 54.68      
Weighted average fair value at grant date, non-vested shares, ending balance | £ / shares £ 53.25   £ 54.68  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 7,403 7,403 6,791 6,791
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | £ / shares £ 51.56   £ 53.28  
– 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 (in shares) 0 0    
Number of non-vested shares, ending balance (in shares) 0 0 0 0
Weighted average fair value at grant date, non-vested shares, beginning balance | $ / shares   $ 0    
Weighted average fair value at grant date, non-vested shares, ending balance | $ / shares   $ 0   $ 0
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 0 0 0 0
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 0   $ 0