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Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Text block [abstract] |
Summary of 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 2017 (ordinary shares of 18 318 / 329 p each) |  |  | 206 |  |  |  | 48 |  |  |  | 93 |  |  |  | 141 |
Share capital consolidation |  |  | (9 | ) |  |  | — |  |  |  | — |  |  |  | — |
Exchange adjustments |  |  | — |  |  |  | 5 |  |  |  | 8 |  |  |  | 13 |
At 31 December 2017 (ordinary shares of 19 17 / 21 p each) |  |  | 197 |  |  |  | 53 |  |  |  | 101 |  |  |  | 154 |
Exchange adjustments |  |  | — |  |  |  | (3 | ) |  |  | (5 | ) |  |  | (8 | )
At 31 December 2018 (ordinary shares of 19 17 / 21 p each) |  |  | 197 |  |  |  | 50 |  |  |  | 96 |  |  |  | 146 |
Share capital consolidation |  |  | (10 | ) |  |  | — |  |  |  | — |  |  |  | — |
Exchange adjustments |  |  | — |  |  |  | 2 |  |  |  | 3 |  |  |  | 5 |
At 31 December 2019 (ordinary shares of 20 340 / 399 p each) |  |  | 187 |  |  |  | 52 |  |  |  | 99 |  |  |  | 151 |
Summary of Cash Flow Hedging Reserve | The cash flow hedging reserve is analysed as follows:
|  | Cash flow hedging reserve |
|  | Value of currency swaps |  |  | Costs of hedging |  |  | Total |
|  | $m |  |  | $m |  |  | $m |
At 1 January 2018 |  |  | — |  |  |  | — |  |  |  | — |
Costs of hedging deferred and recognised in other comprehensive income |  |  | — |  |  |  | (1 | ) |  |  | (1 | )
Change in fair value of currency swaps recognised in other comprehensive income |  |  | 4 |  |  |  | — |  |  |  | 4 |
Reclassified from other comprehensive income to profit or loss – included in financial expenses |  |  | (8 | ) |  |  | — |  |  |  | (8 | )
Deferred tax |  |  | 1 |  |  |  | — |  |  |  | 1 |
At 31 December 2018 |  |  | (3 | ) |  |  | (1 | ) |  |  | (4 | )
Costs of hedging deferred and recognised in other comprehensive income |  |  | — |  |  |  | (6 | ) |  |  | (6 | )
Change in fair value of currency swaps recognised in other comprehensive income |  |  | (34 | ) |  |  | — |  |  |  | (34 | )
Reclassified from other comprehensive income to profit or loss – included in financial expenses |  |  | 38 |  |  |  | — |  |  |  | 38 |
At 31 December 2019 |  |  | 1 |  |  |  | (7 | ) |  |  | (6 | )

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