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Equity (Tables) | 12 Months Ended
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Feb. 15, 2018
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Summary of Equity Share Capital | Equity share capital
|  | Number of shares millions |  |  | Nominal value $m |  |  | Share premium $m |  |  | Equity share capital $m |
Allotted, called up and fully paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At 1 January 2015 (ordinary shares of 15265/329p each) |  |  | 248 |  |  |  | 61 |  |  |  | 117 |  |  |  | 178 |
Exchange adjustments |  |  | — |  |  |  | (3 | ) |  |  | (6 | ) |  |  | (9 | )
At 31 December 2015 (ordinary shares of 15265/329p each) |  |  | 248 |  |  |  | 58 |  |  |  | 111 |  |  |  | 169 |
Share capital consolidation |  |  | (42 | ) |  |  | — |  |  |  | — |  |  |  | — |
Exchange adjustments |  |  | — |  |  |  | (10 | ) |  |  | (18 | ) |  |  | (28 | )
At 31 December 2016 (ordinary shares of 18318/329p each) |  |  | 206 |  |  |  | 48 |  |  |  | 93 |  |  |  | 141 |
Share capital consolidation |  |  | (9 | ) |  |  | — |  |  |  | — |  |  |  | — |
Exchange adjustments |  |  | — |  |  |  | 5 |  |  |  | 8 |  |  |  | 13 |
At 31 December 2017 (ordinary shares of 1917/21p each) |  |  | 197 |  |  |  | 53 |  |  |  | 101 |  |  |  | 154 |

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