XML 237 R128.htm IDEA: XBRL DOCUMENT v3.24.0.1
Post-employment benefit plans - Components of Post-Employment Benefit Plans Service Cost (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]    
DC pension $ (133) $ (118)
Capitalized benefit plans cost 56 64
Total post-employment benefit plans service cost (206) (249)
DB pension    
Disclosure of defined benefit plans [line items]    
Current service cost (128) (193)
OPEBs    
Disclosure of defined benefit plans [line items]    
Current service cost $ (1) $ (2)