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Share-based payments - Summary of performance share plans (Detail) - Performance share plans
 12 Months Ended
Dec. 31, 2023
shares
£ / shares
Dec. 31, 2023
shares
$ / shares
Dec. 31, 2022
shares
£ / shares
Dec. 31, 2022
shares
$ / shares
Rio Tinto plc        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares, beginning balance (in shares) 2,903,449 2,903,449 3,376,072 3,376,072
Number of non-vested shares, awarded (in shares) 562,747 562,747 518,950 518,950
Number of non-vested shares, forfeited (in shares) (166,376) (166,376) (9,973) (9,973)
Number of non-vested shares, failed performance conditions (in shares) 0 0 (326,522) (326,522)
Number of non-vested shares, vested (in shares) (703,009) (703,009) (655,078) (655,078)
Number of non-vested shares, ending balance (in shares) 2,596,811 2,596,811 2,903,449 2,903,449
Weighted average fair value at grant date, non-vested shares, beginning balance | £ / shares £ 24.36   £ 24.26  
Weighted average fair value at grant date, non-vested shares, awarded | £ / shares 28.40   25.60  
Weighted average fair value at grant date, non-vested shares, forfeited | £ / shares 27.94   31.68  
Weighted average fair value at grant date, non-vested shares, failed performance conditions | £ / shares 0   32.83  
Weighted average fair value at grant date, non-vested shares, vested | £ / shares 26.84   20.49  
Weighted average fair value at grant date, non-vested shares, ending balance | £ / shares £ 24.34   £ 24.36  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 767,439 767,439 632,533 632,533
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) (in shares) 181,492 181,492 230,006 230,006
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | £ / shares £ 59.21   £ 54.96  
Weighted average share price, vested awards settled in cash during the year (including dividend shares applied on vesting) | £ / shares £ 58.36   £ 54.67  
Rio Tinto Limited        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares, beginning balance (in shares) 1,040,240 1,040,240 1,276,694 1,276,694
Number of non-vested shares, awarded (in shares) 287,714 287,714 256,508 256,508
Number of non-vested shares, forfeited (in shares) (28,789) (28,789) (38,733) (38,733)
Number of non-vested shares, failed performance conditions (in shares) 0 0 (149,788) (149,788)
Number of non-vested shares, vested (in shares) (287,973) (287,973) (304,441) (304,441)
Number of non-vested shares, ending balance (in shares) 1,011,192 1,011,192 1,040,240 1,040,240
Weighted average fair value at grant date, non-vested shares, beginning balance | $ / shares   $ 52.51   $ 50.46
Weighted average fair value at grant date, non-vested shares, awarded | $ / shares   61.66   51.21
Weighted average fair value at grant date, non-vested shares, forfeited | $ / shares   51.91   51.09
Weighted average fair value at grant date, non-vested shares, failed performance conditions | $ / shares   0   61.40
Weighted average fair value at grant date, non-vested shares, vested | $ / shares   53.88   38.68
Weighted average fair value at grant date, non-vested shares, ending balance | $ / shares   $ 54.74   $ 52.51
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 238,405 238,405 247,216 247,216
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) (in shares) 140,690 140,690 140,479 140,479
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 122.58   $ 115.25
Weighted average share price, vested awards settled in cash during the year (including dividend shares applied on vesting) | $ / shares   $ 123.40   $ 115.35