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Other non-current assets (Tables)
 12 Months Ended
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]  
Disclosure of other non-current assets
FOR THE YEAR ENDED DECEMBER 31 NOTE 2020 2019
Long-term wireless device financing plan receivables 12  399  65 
Investments(1)
 28 167  128 
Publicly-traded and privately-held investments 28  126  129 
Long-term receivables 128  83 
Derivative assets 28  92  200 
Other 89  111 
Total other non-current assets 1,001  716 
(1)These amounts have been pledged as security related to obligations for certain employee benefits and are not available for general use.