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Earnings per ordinary share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Summary of earnings (loss) per ordinary shares |
|  |  |  |  | 2018 |  |  |  |  |  |  |  | 2017 |  |  |  |
|  |  |  | Weighted |  |  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  | average |  |  | 2018 |  |  |  |  | average |  | 2017 |
|  | 2018 |  | number of |  | Per share |  | 2017 |  | number of |  | Per share |
| Earnings |  | shares |  | amount |  | Earnings |  | shares |  | amount |
| US$m |  | (millions) |  | (cents) |  | US$m |  | (millions) |  | (cents) |
Basic earnings per share attributable to ordinary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
shareholders of Rio Tinto (a) |  | 13,638 |  |  | 1,719.3 |  |  | 793.2 |  |  | 8,762 |  |  | 1,786.7 |  |  | 490.4 |
Diluted earnings per share attributable to ordinary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
shareholders of Rio Tinto (b) |  | 13,638 |  |  | 1,731.7 |  |  | 787.6 |  |  | 8,762 |  |  | 1,799.5 |  |  | 486.9 |
|  |  |  |  |  |  | 2016 |  |  |  |
|  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  |  |  |  | average |  | 2016 |
|  |  |  | 2016 |  | number of |  | Per share |
|  |  |  | Earnings |  | shares |  | amount |
|  |  |  | US$m |  | (millions) |  | (cents) |
Basic earnings per share attributable to ordinary |  |  |  |  |  |  |  |  |  |  |  |
shareholders of Rio Tinto (a) |  |  |  |  | 4,617 |  |  | 1,797.3 |  |  | 256.9 |
Diluted earnings per share attributable to ordinary |  |  |  |  |  |  |  |  |  |  |  |
shareholders of Rio Tinto (b) |  |  |  |  | 4,617 |  |  | 1,808.6 |  |  | 255.3 |
(a) | The weighted average number of shares is calculated as the average number of Rio Tinto plc shares outstanding not held as treasury shares of 1,312.7 million (2017: 1,364.5 million; 2016: 1,373.7 million) plus the average number of Rio Tinto Limited shares outstanding of 406.6 million (2017: 422.3 million; 2016: 423.6 million) over the relevant period. No Rio Tinto Limited ordinary shares were held by Rio Tinto plc in any of the periods presented.
(b) | For the purposes of calculating diluted earnings per share, the effect of dilutive securities of 12.4 million shares in 2018 (2017: 12.8 million; 2016: 11.3 million) is added to the weighted average number of shares described in (a) above. This effect is calculated under the treasury stock method. In accordance with IAS 33 “Earnings per share”. The Group’s only potential dilutive ordinary shares are share options for which terms and conditions are described in note 43.

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- Definition The disclosure of earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_66&doctype=Standard -URIDate 2017-03-09 + Details
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