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Share capital - Rio Tinto Limited (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Classes Of Share Capital [Abstract] |
Summary of share capital rio tinto limited |
|  | 2017 |  |  | 2016 |  |  | 2015 |  |  |  |  |  |  |  |  |  |
| Number |  | Number |  | Number |  |  | 2017 |  |  | 2016 |  |  | 2015 |
| (million) |  | (million) |  | (million) |  | US$m |  | US$m |  | US$m |
Issued and fully paid up share capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At 1 January |  | 424.19 |  |  | 424.19 |  |  | 435.76 |  |  | 3,915 |  |  | 3,950 |  |  | 4,535 |
Adjustment on currency translation |  |  |  |  |  |  |  |  |  |  | 310 |  |  | (35 | ) |  | (503 | )
Ordinary shares purchased and cancelled (a) (b) |  | (11.78 | ) |  | - |  |  | (11.57 | ) |  | (85 | ) |  | - |  |  | (82 | )
At 31 December |  | 412.41 |  |  | 424.19 |  |  | 424.19 |  |  | 4,140 |  |  | 3,915 |  |  | 3,950 |
– Special Voting Share (c) | 1 only |  | 1 only |  | 1 only |  |  |  |  |  |  |  |  |  |
– DLC Dividend Share (c) | 1 only |  | 1 only |  | 1 only |  |  |  |  |  |  |  |  |  |
Total share capital |  | 412.41 |  |  | 424.19 |  |  | 424.19 |  |  |  |  |  |  |  |  |  |
(a) | In November 2017, 11,778,064 Rio Tinto Limited ordinary shares were purchased at A$63.67 per share and cancelled under an off-market share buy-back programme carried out pursuant to the shareholder approval granted at Rio Tinto Limited’s 2017 annual general meeting for off-market and on-market buy-backs of up to 42.4 million Rio Tinto Limited ordinary shares.
(b) | In April 2015, 11,566,308 Rio Tinto Limited ordinary shares were purchased at A$48.44 per share and cancelled under an off-market share buy-back programme carried out pursuant to the shareholder approval granted at Rio Tinto Limited’s 2015 annual general meeting for off-market and on-market buy-backs of up to 43.5 million Rio Tinto Limited ordinary shares.
(c) | The “Special Voting Share” was issued to facilitate the joint voting by shareholders of Rio Tinto Limited and Rio Tinto plc on Joint Decisions following the DLC Merger. The “DLC Dividend Share” was issued to facilitate the efficient management of funds within the DLC structure. Directors have the ability to issue an Equalisation Share if that is required under the terms of the DLC Merger Sharing Agreement.

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