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Share-based payments - Summary of performance share plans (Detail) - Performance share plans | 12 Months Ended
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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

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