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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - CAD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance $ 1,470 $ 684
Other Comprehensive Income (Loss), Before Tax (23) 976
Income Tax (Expense) Recovery (5) (20)
Reclassification on Divestiture (Note 3) 12  
Ending balance 1,454 1,640
Pension and Other Post-Employment Benefits    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance 99 28
Other Comprehensive Income (Loss), Before Tax 20 78
Income Tax (Expense) Recovery (5) (20)
Reclassification on Divestiture (Note 3) 0  
Ending balance 114 86
Private Equity Instruments    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance 29 27
Other Comprehensive Income (Loss), Before Tax 0 2
Income Tax (Expense) Recovery 0 0
Reclassification on Divestiture (Note 3) 0  
Ending balance 29 29
Foreign Currency Translation Adjustment    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance 1,342 629
Other Comprehensive Income (Loss), Before Tax (43) 896
Income Tax (Expense) Recovery 0 0
Reclassification on Divestiture (Note 3) 12  
Ending balance $ 1,311 $ 1,525