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Severance, acquisition and other costs (Tables)
 12 Months Ended
Dec. 31, 2018
Analysis of income and expense [abstract]  
Disclosure of severance, acquisition and other costs
FOR THE YEAR ENDED DECEMBER 31
2018

2017

Severance
(92
)
(79
)
Acquisition and other
(44
)
(111
)
Total severance, acquisition and other costs
(136
)
(190
)