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Other (expense) income (Tables) | 12 Months Ended
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Dec. 31, 2017
Analysis of income and expense [abstract] |
Schedule of other income |
FOR THE YEAR ENDED DECEMBER 31 | NOTE |  | 2017 |  | 2016 |
Net mark-to-market gains on derivatives used as economic hedges |  | 88 |  | 67 |
Impairment of assets | 13, 14 |  | (82 | ) | (9 | )
Losses on retirements and disposals of property, plant and equipment and intangible assets |  | (47 | ) | (28 | )
Equity losses from investments in associates and joint ventures | 15 |  |  |
| Loss on investment |  | (22 | ) | (57 | )
| Operations |  | (9 | ) | (32 | )
Early debt redemption costs | 20 |  | (20 | ) | (11 | )
(Losses) gains on investments |  | (5 | ) | 58 |
Other |  | (5 | ) | 33 |
Total other (expense) income |  | (102 | ) | 21 |

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