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Post-employment benefit plans - Post-Employment Benefit Plan Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value of plan assets [line items]    
Equity securities, total plan assets fair value percent 13.00% 15.00%
Debt securities, total plan assets fair value percent 55.00% 52.00%
Alternative investments, total plan asset fair value percent 32.00% 33.00%
Total plan assets fair value percent 100.00% 100.00%
Liabilities $ 51,383 $ 46,814
Defined benefit obligation hedged 3,000  
MLSE financial liability    
Disclosure of fair value of plan assets [line items]    
Liabilities 149 149
DB pension    
Disclosure of fair value of plan assets [line items]    
Plan assets, at fair value 23,768 23,355
Equity securities included in total plan assets $ 9 $ 11
Equity securities percent included in total plan assets 0.04% 0.05%
Debt securities included in total plan assets $ 92 $ 85
Debt securities percent included in total plan assets 0.39% 0.40%
Alternative investments included in total plan assets   $ 149
Alternative investments percent included in total plan assets   0.64%
DB pension | Money market    
Disclosure of fair value of plan assets [line items]    
Debt securities $ 1,222 $ 739
DB pension | Private equities    
Disclosure of fair value of plan assets [line items]    
Alternative investments 831 1,017
DB pension | Hedge funds    
Disclosure of fair value of plan assets [line items]    
Alternative investments 1,268 1,374
DB pension | Real estate and infrastructure    
Disclosure of fair value of plan assets [line items]    
Alternative investments 4,221 4,297
DB pension | Private Debt    
Disclosure of fair value of plan assets [line items]    
Alternative investments 1,237 1,048
DB pension | Other    
Disclosure of fair value of plan assets [line items]    
Alternative investments 32 60
DB pension | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 858 824
DB pension | Canadian | Debt securities, excluding money market    
Disclosure of fair value of plan assets [line items]    
Debt securities 10,284 9,904
DB pension | Foreign    
Disclosure of fair value of plan assets [line items]    
Equity securities 2,265 2,555
DB pension | Foreign | Debt securities, excluding money market    
Disclosure of fair value of plan assets [line items]    
Debt securities $ 1,550 $ 1,537
Bottom of range    
Disclosure of fair value of plan assets [line items]    
Equity securities, weighted average target allocation 0.00%  
Debt securities, weighted average target allocation 50.00%  
Alternative investments, weighted average target allocation 0.00%  
Top of range    
Disclosure of fair value of plan assets [line items]    
Equity securities, weighted average target allocation 40.00%  
Debt securities, weighted average target allocation 100.00%  
Alternative investments, weighted average target allocation 50.00%