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Share-based payments - Summary of performance share plans (Detail) - Performance share plans [member] | 12 Months Ended
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Dec. 31, 2019 shares £ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares £ / shares | Dec. 31, 2018 shares $ / shares
Rio Tinto plc [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of non-vested shares at beginning balance | 3,845,082 | 3,845,082 | 3,555,274 | 3,555,274
Number of non-vested shares, awarded | 755,735 | 755,735 | 801,047 | 801,047
Number of non-vested shares, forfeited | (122,961) | (122,961) | (188,761) | (188,761)
Number of non-vested shares, failed performance conditions | (384,130) | (384,130) | (107,625) | (107,625)
Number of non-vested shares, vested | (290,332) | (290,332) | (214,853) | (214,853)
Number of non-vested shares at ending balance | 3,803,394 | 3,803,394 | 3,845,082 | 3,845,082
Weighted average fair value at grant date, non-vested shares at beginning balance | £ / shares | £ 21.86 |  | £ 20.47 |
Weighted average fair value at grant date, non-vested shares, awarded | £ / shares | 24.68 |  | 26.87 |
Weighted average fair value at grant date, non-vested shares, forfeited | £ / shares | 23.95 |  | 21.45 |
Weighted average fair value at grant date, non-vested shares, failed performance conditions | £ / shares | 23.79 |  | 14.54 |
Weighted average fair value at grant date, non-vested shares, vested | £ / shares | 21.36 |  | 21.57 |
Weighted average fair value at grant date, non-vested shares ending balance | £ / shares | £ 22.20 |  | £ 21.86 |
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) | 339,821 | 339,821 | 248,965 | 248,965
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) | 1,279 | 1,279 | 991 | 991
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) | £ / shares | £ 45.52 |  | £ 42.57 |
Rio Tinto Limited [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of non-vested shares at beginning balance | 1,797,279 | 1,797,279 | 1,609,154 | 1,609,154
Number of non-vested shares, awarded | 297,189 | 297,189 | 387,298 | 387,298
Number of non-vested shares, forfeited | (126,775) | (126,775) | (36,530) | (36,530)
Number of non-vested shares, failed performance conditions | (188,956) | (188,956) | (54,322) | (54,322)
Number of non-vested shares, vested | (142,220) | (142,220) | (108,321) | (108,321)
Number of non-vested shares at ending balance | 1,636,517 | 1,636,517 | 1,797,279 | 1,797,279
Weighted average fair value at grant date, non-vested shares at beginning balance | $ / shares |  | $ 43.34 |  | $ 40.13
Weighted average fair value at grant date, non-vested shares, awarded | $ / shares |  | 54.55 |  | 53.85
Weighted average fair value at grant date, non-vested shares, forfeited | $ / shares |  | 44.02 |  | 43.83
Weighted average fair value at grant date, non-vested shares, failed performance conditions | $ / shares |  | 46.42 |  | 27.67
Weighted average fair value at grant date, non-vested shares, vested | $ / shares |  | 41.72 |  | 40.85
Weighted average fair value at grant date, non-vested shares ending balance | $ / shares |  | $ 45.11 |  | $ 43.34
Number of vested awards settled in shares during the year (including dividend shares applied on vesting) | 151,607 | 151,607 | 105,374 | 105,374
Number of vested awards settled in cash during the year (including dividend shares applied on vesting) | 1,347 | 1,347 | 9,959 | 9,959
Weighted average share price, Vested awards settled in shares during the year (including dividend shares applied on vesting) | $ / shares |  | $ 100.30 |  | $ 82.97
Weighted average share price, Vested awards settled in cash during the year (including dividend shares applied on vesting) | (per share) | £ 43.65 | $ 92.97 | £ 42.40 | $ 82.08

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