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Financial and capital management - Fair Value Details of Financial Instruments Measured at Amortized Cost (Details) - Financial liabilities at amortised cost, category - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
CRTC deferral account obligation    
Disclosure of financial liabilities [line items]    
CARRYING VALUE $ 66 $ 82
FAIR VALUE 67 86
Debt securities and other debt    
Disclosure of financial liabilities [line items]    
CARRYING VALUE 23,729 20,525
FAIR VALUE $ 26,354 $ 24,366