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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, 2023
shares
£ / shares
Dec. 31, 2023
shares
$ / shares
Dec. 31, 2022
shares
£ / shares
Dec. 31, 2022
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) 2,585,679 2,585,679 2,493,826 2,493,826
Number of non-vested shares, awarded (in shares) 1,298,578 1,298,578 1,187,887 1,187,887
Number of non-vested shares, forfeited (in shares) (113,473) (113,473) (146,816) (146,816)
Number of non-vested shares, cancelled (71,160) (71,160) (65,267) (65,267)
Number of non-vested shares, vested (in shares) (889,496) (889,496) (883,951) (883,951)
Number of non-vested shares, ending balance (in shares) 2,810,128 2,810,128 2,585,679 2,585,679
Weighted average fair value at grant date, non-vested shares, beginning balance | £ / shares £ 47.22   £ 43.55  
Weighted average fair value at grant date, non-vested shares, awarded | £ / shares 49.59   50.37  
Weighted average fair value at grant date, non-vested shares, forfeited | £ / shares 57.02   56.66  
Weighted average fair value at grant date, non-vested shares, cancelled | £ / shares 46.21   44.99  
Weighted average fair value at grant date, non-vested shares, vested | £ / shares 39.59   39.69  
Weighted average fair value at grant date, non-vested shares, ending balance | £ / shares £ 50.36   £ 47.22  
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) 2,340,705 2,340,705 2,164,568 2,164,568
Number of non-vested shares, awarded (in shares) 1,159,498 1,159,498 1,068,556 1,068,556
Number of non-vested shares, forfeited (in shares) (144,531) (144,531) (155,631) (155,631)
Number of non-vested shares, cancelled (61,993) (61,993) (46,300) (46,300)
Number of non-vested shares, vested (in shares) (712,686) (712,686) (690,488) (690,488)
Number of non-vested shares, ending balance (in shares) 2,580,993 2,580,993 2,340,705 2,340,705
Weighted average fair value at grant date, non-vested shares, beginning balance | $ / shares   $ 95.27   $ 92.31
Weighted average fair value at grant date, non-vested shares, awarded | $ / shares   107.86   95.69
Weighted average fair value at grant date, non-vested shares, forfeited | $ / shares   102.40   96.46
Weighted average fair value at grant date, non-vested shares, cancelled | $ / shares   93.15   86.44
Weighted average fair value at grant date, non-vested shares, vested | $ / shares   86.09   86.96
Weighted average fair value at grant date, non-vested shares, ending balance | $ / shares   $ 103.11   $ 95.27
– 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) 1,220,559 1,220,559    
Number of non-vested shares, ending balance (in shares) 1,321,207 1,321,207 1,220,559 1,220,559
Weighted average fair value at grant date, non-vested shares, beginning balance | £ / shares £ 48.82      
Weighted average fair value at grant date, non-vested shares, ending balance | £ / shares £ 54.05   £ 48.82  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 537,748 537,748 529,054 529,054
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | £ / shares £ 57.86   £ 54.59  
– 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) 1,150,641 1,150,641    
Number of non-vested shares, ending balance (in shares) 1,211,757 1,211,757 1,150,641 1,150,641
Weighted average fair value at grant date, non-vested shares, beginning balance | $ / shares   $ 103.00    
Weighted average fair value at grant date, non-vested shares, ending balance | $ / shares   $ 113.03   $ 103.00
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 476,813 476,813 486,587 486,587
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 121.87   $ 113.18
– 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) 139,782 139,782    
Number of non-vested shares, ending balance (in shares) 102,388 102,388 139,782 139,782
Weighted average fair value at grant date, non-vested shares, beginning balance | £ / shares £ 55.96      
Weighted average fair value at grant date, non-vested shares, ending balance | £ / shares £ 55.64   £ 55.96  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 87,475 87,475 136,317 136,317
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | £ / shares £ 55.43   £ 55.11  
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) (in shares) 0 0 23,611 23,611
Weighted average share price, vested awards settled in cash during the year (including dividend shares applied on vesting) | £ / shares £ 0   £ 55.98  
– 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) 60,862 60,862    
Number of non-vested shares, ending balance (in shares) 56,597 56,597 60,862 60,862
Weighted average fair value at grant date, non-vested shares, beginning balance | $ / shares   $ 113.13    
Weighted average fair value at grant date, non-vested shares, ending balance | $ / shares   $ 113.90   $ 113.13
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 23,569 23,569 32,080 32,080
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 123.91   $ 107.78
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) (in shares) 0 0 12,699 12,699
Weighted average share price, vested awards settled in cash during the year (including dividend shares applied on vesting) | $ / shares   $ 0   $ 113.23
– 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) 1,191,738 1,191,738    
Number of non-vested shares, ending balance (in shares) 1,350,559 1,350,559 1,191,738 1,191,738
Weighted average fair value at grant date, non-vested shares, beginning balance | £ / shares £ 44.51      
Weighted average fair value at grant date, non-vested shares, ending balance | £ / shares £ 46.22   £ 44.51  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 493,187 493,187 478,204 478,204
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | £ / shares £ 55.05   £ 51.52  
– 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) 1,129,202 1,129,202    
Number of non-vested shares, ending balance (in shares) 1,312,639 1,312,639 1,129,202 1,129,202
Weighted average fair value at grant date, non-vested shares, beginning balance | $ / shares   $ 86.43    
Weighted average fair value at grant date, non-vested shares, ending balance | $ / shares   $ 93.50   $ 86.43
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 374,232 374,232 337,782 337,782
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 118.12   $ 104.82
– 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) 33,600 33,600    
Number of non-vested shares, ending balance (in shares) 35,974 35,974 33,600 33,600
Weighted average fair value at grant date, non-vested shares, beginning balance | £ / shares £ 49.05      
Weighted average fair value at grant date, non-vested shares, ending balance | £ / shares £ 54.68   £ 49.05  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 6,791 6,791 12,176 12,176
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | £ / shares £ 53.28   £ 55.20  
– 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