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Severance, acquisition and other costs (Tables)
 12 Months Ended
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
)