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Share-based payments - Summary of performance share plans (Detail) - Performance share plans
 12 Months Ended
Dec. 31, 2024
shares
£ / shares
Dec. 31, 2024
shares
$ / shares
Dec. 31, 2023
shares
£ / shares
Dec. 31, 2023
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) 2,596,811 2,596,811 2,903,449 2,903,449
Number of non-vested shares, awarded (in shares) 1,077,110 1,077,110 562,747 562,747
Number of non-vested shares, forfeited (in shares) (77,417) (77,417) (166,376) (166,376)
Number of non-vested shares, failed performance conditions (in shares) (38,101) (38,101) 0 0
Number of non-vested shares, vested (in shares) (801,809) (801,809) (703,009) (703,009)
Number of non-vested shares, ending balance (in shares) 2,756,594 2,756,594 2,596,811 2,596,811
Weighted average fair value at grant date, non-vested shares, beginning balance | £ / shares £ 24.34   £ 24.36  
Weighted average fair value at grant date, non-vested shares, awarded | £ / shares 28.22   28.40  
Weighted average fair value at grant date, non-vested shares, forfeited | £ / shares 27.33   27.94  
Weighted average fair value at grant date, non-vested shares, failed performance conditions | £ / shares 24.68   0  
Weighted average fair value at grant date, non-vested shares, vested | £ / shares 24.52   26.84  
Weighted average fair value at grant date, non-vested shares, ending balance | £ / shares £ 25.71   £ 24.34  
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 924,836 924,836 767,439 767,439
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) (in shares) 111,446 111,446 181,492 181,492
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | £ / shares £ 51.12   £ 59.21  
Weighted average share price, vested awards settled in cash during the year (including dividend shares applied on vesting) | £ / shares £ 51.70   £ 58.36  
– Rio Tinto Limited        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of non-vested shares, beginning balance (in shares) 1,011,192 1,011,192 1,040,240 1,040,240
Number of non-vested shares, awarded (in shares) 579,982 579,982 287,714 287,714
Number of non-vested shares, forfeited (in shares) (35,737) (35,737) (28,789) (28,789)
Number of non-vested shares, failed performance conditions (in shares) (11,058) (11,058) 0 0
Number of non-vested shares, vested (in shares) (175,600) (175,600) (287,973) (287,973)
Number of non-vested shares, ending balance (in shares) 1,368,779 1,368,779 1,011,192 1,011,192
Weighted average fair value at grant date, non-vested shares, beginning balance | $ / shares   $ 54.74   $ 52.51
Weighted average fair value at grant date, non-vested shares, awarded | $ / shares   67.34   61.66
Weighted average fair value at grant date, non-vested shares, forfeited | $ / shares   60.05   51.91
Weighted average fair value at grant date, non-vested shares, failed performance conditions | $ / shares   54.55   0
Weighted average fair value at grant date, non-vested shares, vested | $ / shares   54.55   53.88
Weighted average fair value at grant date, non-vested shares, ending balance | $ / shares   $ 59.97   $ 54.74
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) (in shares) 143,996 143,996 238,405 238,405
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) (in shares) 83,388 83,388 140,690 140,690
Weighted average share price, vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares   $ 124.24   $ 122.58
Weighted average share price, vested awards settled in cash during the year (including dividend shares applied on vesting) | $ / shares   $ 124.36   $ 123.40