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Other non-current liabilities (Tables)
 12 Months Ended
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]  
Disclosure of other non-current liabilities
FOR THE YEAR ENDED DECEMBER 31 NOTE 2020 2019
Long-term disability benefits obligation 361  305 
Provisions 25 355  298 
Derivative liabilities 28 98  7 
CRTC deferral account obligation 28 69  69 
Other 262  192 
Total other non-current liabilities 1,145  871