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Provisions (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in other provisions [abstract]    
Beginning balance $ 362  
Additions 45  
Usage (31)  
Reversals (25)  
Ending balance 351  
Current 65 $ 74
Non-current 286 288
Total other provisions 351 362
AROs    
Reconciliation of changes in other provisions [abstract]    
Beginning balance 165  
Additions 6  
Usage (5)  
Reversals (3)  
Ending balance 163  
Current 30  
Non-current 133  
Total other provisions 163 165
Other    
Reconciliation of changes in other provisions [abstract]    
Beginning balance 197  
Additions 39  
Usage (26)  
Reversals (22)  
Ending balance 188  
Current 35  
Non-current 153  
Total other provisions $ 188 $ 197