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Income Taxes - Provision for Income Taxes (Detail) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) $ 902 $ 49 $ 1,327 $ 96
Deferred Tax Expense (Recovery) (61) 63 57 90
Tax Expense (Recovery) From Continuing Operations 841 112 [1] 1,384 186 [1]
Canada        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) 570 2 937 14
United States        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) 261 0 281 0
Asia Pacific        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) 71 47 109 81
Other International        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) $ 0 $ 0 $ 0 $ 1
[1] See Note 3 for revisions to prior period results.