XML 246 R131.htm IDEA: XBRL DOCUMENT v3.25.0.1
Post-employment benefit plans - Components of Post-Employment Benefit Plans Financing Cost (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of net defined benefit liability (asset) [line items]    
Total net return on post-employment benefit plans $ 66 $ 108
DB pension    
Disclosure of net defined benefit liability (asset) [line items]    
Total net return on post-employment benefit plans 99 149
OPEBs    
Disclosure of net defined benefit liability (asset) [line items]    
Total net return on post-employment benefit plans $ (33) $ (41)