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Provisions (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in other provisions [abstract]    
Beginning balance $ 351  
Additions 52  
Usage (45)  
Reversals (12)  
Acquisition 7  
Ending balance 353  
Current 65 $ 65
Non-current 288 286
Total other provisions 353 351
AROs    
Reconciliation of changes in other provisions [abstract]    
Beginning balance 163  
Additions 0  
Usage (9)  
Reversals 0  
Acquisition 7  
Ending balance 161  
Current 32  
Non-current 129  
Total other provisions 161 163
Other    
Reconciliation of changes in other provisions [abstract]    
Beginning balance 188  
Additions 52  
Usage (36)  
Reversals (12)  
Acquisition 0  
Ending balance 192  
Current 33  
Non-current 159  
Total other provisions $ 192 $ 188