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Interest expense (Tables) | 12 Months Ended
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Dec. 31, 2017
Borrowing costs [abstract] |
Disclosure of interest expense |
FOR THE YEAR ENDED DECEMBER 31 | 2017 |  | 2016 |
Interest expense on long-term debt | (898 | ) | (852 | )
Interest expense on other debt | (101 | ) | (86 | )
Capitalized interest | 44 |  | 50 |
Total interest expense | (955 | ) | (888 | )

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