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Financial and capital management - Financial Instruments Measured at Fair Value (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]    
Assets $ 60,665 $ 60,146
Liabilities $ (39,336) (38,738)
Repurchase obligation of trust ownership percentage 9.00%  
MLSE financial liability    
Disclosure of financial assets [line items]    
Liabilities $ (149) (135)
MLSE financial liability | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1)    
Disclosure of financial assets [line items]    
Liabilities 0 0
MLSE financial liability | OBSERVABLE MARKET DATA (LEVEL 2)    
Disclosure of financial assets [line items]    
Liabilities 0 0
MLSE financial liability | NON-OBSERVABLE MARKET INPUTS (LEVEL 3)    
Disclosure of financial assets [line items]    
Liabilities (149) (135)
Publicly-traded and privately-held investments    
Disclosure of financial assets [line items]    
Assets 126 129
Publicly-traded and privately-held investments | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1)    
Disclosure of financial assets [line items]    
Assets 3 2
Publicly-traded and privately-held investments | OBSERVABLE MARKET DATA (LEVEL 2)    
Disclosure of financial assets [line items]    
Assets 0 0
Publicly-traded and privately-held investments | NON-OBSERVABLE MARKET INPUTS (LEVEL 3)    
Disclosure of financial assets [line items]    
Assets 123 127
Derivative financial instruments | Derivative financial instruments    
Disclosure of financial assets [line items]    
Assets (liabilities) (51) 165
Derivative financial instruments | Derivative financial instruments | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1)    
Disclosure of financial assets [line items]    
Assets (liabilities) 0 0
Derivative financial instruments | Derivative financial instruments | OBSERVABLE MARKET DATA (LEVEL 2)    
Disclosure of financial assets [line items]    
Assets (liabilities) (51) 165
Derivative financial instruments | Derivative financial instruments | NON-OBSERVABLE MARKET INPUTS (LEVEL 3)    
Disclosure of financial assets [line items]    
Assets (liabilities) 0 0
Other | Other    
Disclosure of financial assets [line items]    
Assets (liabilities) 109 71
Other | Other | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1)    
Disclosure of financial assets [line items]    
Assets (liabilities) 0 1
Other | Other | OBSERVABLE MARKET DATA (LEVEL 2)    
Disclosure of financial assets [line items]    
Assets (liabilities) 167 128
Other | Other | NON-OBSERVABLE MARKET INPUTS (LEVEL 3)    
Disclosure of financial assets [line items]    
Assets (liabilities) $ (58) $ (58)