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Share-based payments (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Charge has been recognised in income statement for Rio Tinto's share-based incentive plans, and the related liability (for cash-settled plans) | The charge that has been recognised in the income statement for Rio Tinto’s share-based incentive plans, and the related liability (for cash-settled plans), is set out in the table below.
| Charge recognised for the year | Liability at the end of the year
| 2019 US$m |  | 2018 US$m |  | 2017 US$m |  | 2019 US$m |  | 2018 US$m |
Equity-settled plans | 118 |  | 118 |  | 88 |  | — |  | — |
Cash-settled plans | 5 |  | 4 |  | 3 |  | 19 |  | 16 |
Total | 123 |  | 122 |  | 91 |  | 19 |  | 16 |
Performance share plans [member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Summary of non-vested and vested shares |
| Rio Tinto plc awards | Rio Tinto Limited awards
| 2019 number |  | Weighted average fair value at grant date 2019 £ |  | 2018 number |  | Weighted average fair value at grant date 2018 £ |  | 2019 number |  | Weighted average fair value at grant date 2019 A$ |  | 2018 number |  | Weighted average fair value at grant date 2018 A$ |
Non-vested shares at 1 January | 3,845,082 |  | 21.86 |  | 3,555,274 |  | 20.47 |  | 1,797,279 |  | 43.34 |  | 1,609,154 |  | 40.13 |
Awarded | 755,735 |  | 24.68 |  | 801,047 |  | 26.87 |  | 297,189 |  | 54.55 |  | 387,298 |  | 53.85 |
Forfeited | (122,961 | ) | 23.95 |  | (188,761 | ) | 21.45 |  | (126,775 | ) | 44.02 |  | (36,530 | ) | 43.83 |
Failed performance conditions | (384,130 | ) | 23.79 |  | (107,625 | ) | 14.54 |  | (188,956 | ) | 46.42 |  | (54,322 | ) | 27.67 |
Vested | (290,332 | ) | 21.36 |  | (214,853 | ) | 21.57 |  | (142,220 | ) | 41.72 |  | (108,321 | ) | 40.85 |
Non-vested shares at 31 December | 3,803,394 |  | 22.20 |  | 3,845,082 |  | 21.86 |  | 1,636,517 |  | 45.11 |  | 1,797,279 |  | 43.34 |
| Rio Tinto plc awards | Rio Tinto Limited awards
| 2019 number |  | Weighted average fair value at grant date 2019 £ |  | 2018 number |  | Weighted average fair value at grant date 2018 £ |  | 2019 number |  | Weighted average fair value at grant date 2019 A$ |  | 2018 number |  | Weighted average fair value at grant date 2018 A$ |
Vested awards settled in shares during the year (including dividend shares applied on vesting) | 339,821 |  | 45.52 |  | 248,965 |  | 42.57 |  | 151,607 |  | 100.30 |  | 105,374 |  | 82.97 |
Vested awards settled in cash during the year (including dividend shares applied on vesting) | 1,279 |  | 43.65 |  | 991 |  | 42.40 |  | 1,347 |  | 92.97 |  | 9,959 |  | 82.08 |
Share Incentive Plans [Member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Summary of non-vested and vested shares |
| Rio Tinto plc awards(a) | Rio Tinto Limited awards
| 2019 number |  | Weighted average fair value at grant date 2019 £ |  | 2018 number |  | Weighted average fair value at grant date 2018 £ |  | 2019 number |  | Weighted average fair value at grant date 2019 A$ |  | 2018 number |  | Weighted average fair value at grant date 2018 A$ |
Non-vested awards at 1 January | 3,042,020 |  | 31.43 |  | 3,473,092 |  | 27.23 |  | 2,613,930 |  | 61.71 |  | 2,933,237 |  | 54.15 |
Awarded | 1,043,817 |  | 40.41 |  | 1,135,103 |  | 39.49 |  | 846,008 |  | 86.56 |  | 943,315 |  | 78.36 |
Forfeited | (224,402 | ) | 39.46 |  | (250,853 | ) | 30.26 |  | (174,025 | ) | 72.18 |  | (185,062 | ) | 64.60 |
Cancelled | (24,043 | ) | 32.87 |  | (33,563 | ) | 26.52 |  | (35,481 | ) | 60.91 |  | (36,613 | ) | 52.84 |
Vested | (1,224,379 | ) | 25.40 |  | (1,281,759 | ) | 27.54 |  | (976,763 | ) | 49.39 |  | (1,040,947 | ) | 55.30 |
Non-vested shares at 31 December | 2,613,013 |  | 37.14 |  | 3,042,020 |  | 31.43 |  | 2,273,669 |  | 75.46 |  | 2,613,930 |  | 61.71 |
Comprising: |  |  |  |  |  |  |  |
– Management Share Awards | 1,398,039 |  | 38.68 |  | 1,666,082 |  | 32.52 |  | 1,363,601 |  | 78.67 |  | 1,520,292 |  | 64.06 |
– Bonus Deferral Awards | 192,878 |  | 41.95 |  | 203,900 |  | 37.86 |  | 87,930 |  | 87.81 |  | 127,423 |  | 71.93 |
– Global Employee Share Plan | 982,932 |  | 33.98 |  | 1,102,322 |  | 28.68 |  | 822,138 |  | 68.82 |  | 966,215 |  | 56.66 |
– UK Share Plan | 39,164 |  | 37.86 |  | 69,716 |  | 29.90 |  | — |  | — |  | — |  | — |
| 2019 number |  | Weighted average fair value at grant date 2019 £ |  | 2018 number |  | Weighted average fair value at grant date 2018 £ |  | 2019 number |  | Weighted average fair value at grant date 2019 A$ |  | 2018 number |  | Weighted average fair value at grant date 2018 A$ |
Vested awards settled in shares during the year (including dividend shares applied on vesting): |  |  |  |  |  |  |  |
– Management Share Awards | 681,242 |  | 43.68 |  | 669,678 |  | 40.03 |  | 582,948 |  | 93.05 |  | 570,173 |  | 80.87 |
– Bonus Deferral Awards | 163,076 |  | 42.53 |  | 221,198 |  | 37.69 |  | 85,142 |  | 97.30 |  | 108,001 |  | 75.36 |
– Global Employee Share Plan | 543,426 |  | 43.04 |  | 451,710 |  | 39.06 |  | 421,614 |  | 91.50 |  | 473,420 |  | 78.78 |
– UK Share Plan | 34,196 |  | 42.21 |  | 16,968 |  | 38.21 |  | — |  | — |  | — |  | — |
(a) | Awards of Rio Tinto American Depository Receipts (ADRs) under the Global Employee Share Plan are included within the totals for Rio Tinto plc awards for the purpose of these tables.

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