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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, 2020
Dec. 31, 2019
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning Balance $ 827 $ 1,038
Other Comprehensive Income (Loss), Before Tax (54) (208)
Income Tax 2 (3)
Ending Balance 775 827
Defined Benefit Pension Plan [Member]    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning Balance (2) (7)
Other Comprehensive Income (Loss), Before Tax (10) 6
Income Tax 2 (1)
Ending Balance (10) (2)
Private Equity Instruments [Member]    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning Balance 27 15
Other Comprehensive Income (Loss), Before Tax   14
Income Tax   (2)
Ending Balance 27 27
Foreign Currency Translation Adjustment [Member]    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning Balance 802 1,030
Other Comprehensive Income (Loss), Before Tax (44) (228)
Ending Balance $ 758 $ 802