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Accumulated Other Comprehensive Income (Loss) (Details) - CAD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance $ 2,313 $ 1,208
Other Comprehensive Income (Loss), Before Tax (433) 372
Reclassification on Divestiture (Note 5) (1,261)  
Income Tax (Expense) Recovery 0 (19)
Ending balance 619 1,561
Pension and Other Post-Employment Benefits    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance 69 55
Other Comprehensive Income (Loss), Before Tax 13 14
Reclassification on Divestiture (Note 5) 0  
Income Tax (Expense) Recovery (3) (3)
Ending balance 79 66
Private Equity Investments    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance 156 85
Other Comprehensive Income (Loss), Before Tax (26) 139
Reclassification on Divestiture (Note 5) 0  
Income Tax (Expense) Recovery 3 (16)
Ending balance 133 208
Foreign Currency Translation Adjustment    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance 2,088 1,068
Other Comprehensive Income (Loss), Before Tax (420) 219
Reclassification on Divestiture (Note 5) (1,261)  
Income Tax (Expense) Recovery 0 0
Ending balance $ 407 $ 1,287