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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance $ 1,208 $ 1,470
Other Comprehensive Income (Loss), Before Tax 1,120 (281)
Reclassification on Divestiture (Note 5)   12
Income Tax (Expense) Recovery (15) 7
Ending balance 2,313 1,208
Pension and Other Post-Retirement Benefits    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance 55 99
Other Comprehensive Income (Loss), Before Tax 19 (58)
Reclassification on Divestiture (Note 5)   0
Income Tax (Expense) Recovery (5) 14
Ending balance 69 55
Private Equity Instruments    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance 85 29
Other Comprehensive Income (Loss), Before Tax 81 63
Reclassification on Divestiture (Note 5)   0
Income Tax (Expense) Recovery (10) (7)
Ending balance 156 85
Foreign Currency Translation Adjustment    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance 1,068 1,342
Other Comprehensive Income (Loss), Before Tax 1,020 (286)
Reclassification on Divestiture (Note 5)   12
Income Tax (Expense) Recovery 0 0
Ending balance $ 2,088 $ 1,068