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Post-employee benefit plans - Post-Employment Benefit Plan Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value of plan assets [line items]    
Equity securities, total plan assets fair value percent 23.00% 22.00%
Debt securities, total plan assets fair value percent 60.00% 62.00%
Alternative investments, total plan asset fair value percent 17.00% 16.00%
Total plan assets fair value percent 100.00% 100.00%
Defined benefit obligation hedged $ 4,000  
DB pension    
Disclosure of fair value of plan assets [line items]    
Plan assets, at fair value 27,785 $ 25,530
Equity securities included in total plan assets $ 3 $ 15
Equity securities percent included in total plan assets 0.01% 0.06%
Debt securities included in total plan assets $ 141 $ 53
Debt securities percent included in total plan assets 0.51% 0.21%
Alternative investments included in total plan assets $ 149 $ 135
Alternative investments percent included in total plan assets 0.54% 0.53%
DB pension | Money market    
Disclosure of fair value of plan assets [line items]    
Debt securities $ 369 $ 219
DB pension | Private equities    
Disclosure of fair value of plan assets [line items]    
Alternative investments 2,564 2,119
DB pension | Hedge funds    
Disclosure of fair value of plan assets [line items]    
Alternative investments 1,200 1,001
DB pension | Real estate    
Disclosure of fair value of plan assets [line items]    
Alternative investments 1,033 948
DB pension | Other    
Disclosure of fair value of plan assets [line items]    
Alternative investments 76 91
DB pension | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 1,027 1,017
DB pension | Canadian | Debt securities, excluding money market    
Disclosure of fair value of plan assets [line items]    
Debt securities 13,361 13,216
DB pension | Foreign    
Disclosure of fair value of plan assets [line items]    
Equity securities 5,242 4,534
DB pension | Foreign | Debt securities, excluding money market    
Disclosure of fair value of plan assets [line items]    
Debt securities $ 2,913 $ 2,385
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 60.00%  
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%