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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, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [line items]    
DC pension $ (136) $ (133)
Capitalized benefit plans cost 63 56
Total post-employment benefit plans service cost (208) (206)
DB pension    
Disclosure of defined benefit plans [line items]    
Current service cost (134) (128)
OPEBs    
Disclosure of defined benefit plans [line items]    
Current service cost $ (1) $ (1)