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Post-employment benefit plans - Post-Employment Benefit Plan Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Mar. 01, 2023
Jan. 01, 2023
Dec. 31, 2021
Disclosure of fair value of plan assets [line items]        
Equity securities, total plan assets fair value percent 15.00%     16.00%
Debt securities, total plan assets fair value percent 52.00%     61.00%
Alternative investments, total plan asset fair value percent 33.00%     23.00%
Total plan assets fair value percent 100.00%     100.00%
Liabilities $ 46,814     $ 43,823
Defined benefit obligation hedged 4,000      
MLSE financial liability        
Disclosure of fair value of plan assets [line items]        
Liabilities 149     149
Repurchased obligation | 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 23,355     28,040
Equity securities included in total plan assets $ 11     $ 3
Equity securities percent included in total plan assets 0.05%     0.01%
Debt securities included in total plan assets $ 85     $ 85
Debt securities percent included in total plan assets 0.40%     0.30%
Alternative investments included in total plan assets $ 149     $ 149
Alternative investments percent included in total plan assets 0.64%     0.53%
DB pension | Money market        
Disclosure of fair value of plan assets [line items]        
Debt securities $ 739     $ 1,466
DB pension | Private equities        
Disclosure of fair value of plan assets [line items]        
Alternative investments 1,017     976
DB pension | Hedge funds        
Disclosure of fair value of plan assets [line items]        
Alternative investments 1,374     1,208
DB pension | Real estate and infrastructure        
Disclosure of fair value of plan assets [line items]        
Alternative investments 4,297     3,576
DB pension | Private Debt        
Disclosure of fair value of plan assets [line items]        
Alternative investments 1,048     695
DB pension | Other        
Disclosure of fair value of plan assets [line items]        
Alternative investments 60     55
DB pension | Canadian        
Disclosure of fair value of plan assets [line items]        
Equity securities 824     952
DB pension | Canadian | Debt securities, excluding money market        
Disclosure of fair value of plan assets [line items]        
Debt securities 9,904     13,643
DB pension | Foreign        
Disclosure of fair value of plan assets [line items]        
Equity securities 2,555     3,436
DB pension | Foreign | Debt securities, excluding money market        
Disclosure of fair value of plan assets [line items]        
Debt securities $ 1,537     $ 2,033
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%