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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, 2021
Dec. 31, 2020
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance $ 775 $ 827
Other Comprehensive Income (Loss), Before Tax (82) (54)
Income Tax (Expense) Recovery (9) 2
Ending balance 684 775
Pension and Other Post-Retirement Benefits    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance (10) (2)
Other Comprehensive Income (Loss), Before Tax 47 (10)
Income Tax (Expense) Recovery (9) 2
Ending balance 28 (10)
Private Equity Instruments    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance 27 27
Other Comprehensive Income (Loss), Before Tax 0 0
Income Tax (Expense) Recovery 0 0
Ending balance 27 27
Foreign Currency Translation Adjustment    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance 758 802
Other Comprehensive Income (Loss), Before Tax (129) (44)
Income Tax (Expense) Recovery 0 0
Ending balance $ 629 $ 758