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Financial and capital management - Financial Instruments Measured at Fair Value (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [line items]    
Assets $ 71,940 $ 69,329
Liabilities $ 51,383 46,814
Repurchase obligation of trust ownership percentage 9.00%  
MLSE financial liability    
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
MLSE financial liability | OBSERVABLE MARKET DATA (LEVEL 2)    
Disclosure of financial assets [line items]    
Liabilities   0
MLSE financial liability | NON-OBSERVABLE MARKET INPUTS (LEVEL 3)    
Disclosure of financial assets [line items]    
Liabilities   149
Publicly-traded and privately-held investments    
Disclosure of financial assets [line items]    
Assets 587 215
Publicly-traded and privately-held investments | QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1)    
Disclosure of financial assets [line items]    
Assets 10 9
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 577 206
Derivative financial instruments | Derivative financial instruments    
Disclosure of financial assets [line items]    
Assets (liabilities) (488) 72
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) (488) 72
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) 147 108
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) 216 184
Other | Other | NON-OBSERVABLE MARKET INPUTS (LEVEL 3)    
Disclosure of financial assets [line items]    
Assets (liabilities) $ (69) $ (76)