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Other non-current assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Subclassifications of assets, liabilities and equities [abstract]    
Long-term wireless device financing plan receivables $ 399 $ 65
Investments 167 128
Publicly-traded and privately-held investments 126 129
Long-term receivables 128 83
Derivative assets 92 200
Other 89 111
Total other non-current assets $ 1,001 $ 716