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Financial and capital management - Financial Instruments Measured at Fair Value (Details) - CAD ($)
$ in Millions
Mar. 01, 2023
Jan. 01, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of financial assets [line items]        
Assets     $ 69,329 $ 66,764
Liabilities     $ (46,814) (43,823)
Repurchase obligation of trust ownership percentage     9.00%  
MLSE financial liability        
Disclosure of financial assets [line items]        
Liabilities     $ (149) (149)
MLSE financial liability | Repurchased obligation        
Disclosure of financial assets [line items]        
Liabilities $ (149) $ (149)    
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) (149)
Publicly-traded and privately-held investments        
Disclosure of financial assets [line items]        
Assets     215 183
Publicly-traded and privately-held investments | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1)        
Disclosure of financial assets [line items]        
Assets     9 24
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     206 159
Derivative financial instruments | Derivative financial instruments        
Disclosure of financial assets [line items]        
Assets (liabilities)     72 279
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)     72 279
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)     108 122
Other | Other | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1)        
Disclosure of financial assets [line items]        
Assets (liabilities)     0 0
Other | Other | OBSERVABLE MARKET DATA (LEVEL 2)        
Disclosure of financial assets [line items]        
Assets (liabilities)     184 185
Other | Other | NON-OBSERVABLE MARKET INPUTS (LEVEL 3)        
Disclosure of financial assets [line items]        
Assets (liabilities)     $ (76) $ (63)