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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, 2021
Sep. 30, 2020
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance $ 775 $ 827
Other Comprehensive Income (Loss), Before Tax (49) 124
Income Tax (Expense) Recovery (6) 1
Ending balance 720 952
Defined Benefit Pension Plan    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance (10) (2)
Other Comprehensive Income (Loss), Before Tax 27 (4)
Income Tax (Expense) Recovery (6) 1
Ending balance 11 (5)
Private Equity Instruments    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance 27 27
Other Comprehensive Income (Loss), Before Tax 0 1
Income Tax (Expense) Recovery 0 0
Ending balance 27 28
Foreign Currency Translation Adjustment    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance 758 802
Other Comprehensive Income (Loss), Before Tax (76) 127
Income Tax (Expense) Recovery 0 0
Ending balance $ 682 $ 929