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Other non-current liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Subclassifications of assets, liabilities and equities [abstract]    
Long-term disability benefits obligation $ 361 $ 305
Provisions 355 298
Derivative liabilities 98 7
CRTC deferral account obligation 69 69
Other 262 192
Total other non-current liabilities $ 1,145 $ 871