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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - CAD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance $ 684 $ 775
Other Comprehensive Income (Loss), Before Tax 249 (284)
Income Tax (Expense) Recovery (20) (6)
Ending balance 913 485
Defined Benefit Pension Plan [Member]    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance 28 (10)
Other Comprehensive Income (Loss), Before Tax 77 28
Income Tax (Expense) Recovery (20) (6)
Ending balance 85 12
Reserve of gains and losses from investments in equity instruments [member]    
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 26
Reserve of exchange differences on translation [member]    
Disclosure of accumulated other comprehensive income loss [line items]    
Beginning balance 629 758
Other Comprehensive Income (Loss), Before Tax 172 (311)
Income Tax (Expense) Recovery 0 0
Ending balance $ 801 $ 447