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Post-employment benefit plans - Components of Post-Employment Benefit Plans Service Cost (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]    
DC pension $ (118) $ (113)
Capitalized benefit plans cost 64 72
Total post-employment benefit plans service cost (249) (266)
DB pension    
Disclosure of defined benefit plans [line items]    
Current service cost (193) (223)
OPEBs    
Disclosure of defined benefit plans [line items]    
Current service cost $ (2) $ (2)