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Severance, acquisition and other costs (Tables) | 12 Months Ended
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Dec. 31, 2017
Analysis of income and expense [abstract] |
Disclosure of severance, acquisition and other costs |
FOR THE YEAR ENDED DECEMBER 31 | 2017 |  | 2016 |
Severance | (79 | ) | (87 | )
Acquisition and other | (111 | ) | (48 | )
Total severance, acquisition and other costs | (190 | ) | (135 | )

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