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Income Taxes - Provision for Income Taxes (Detail) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery)   $ 276 $ (13) $ 17
Deferred Tax Expense (Recovery)   452 (838) (814)
Total Tax Expense (Recovery) From Operations   728 (851) [1] (797) [1]
Canada        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery)   104 (14) 14
Deferred Tax Expense (Recovery) $ 106      
United States        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery)   0 1 3
Deferred Tax Expense (Recovery) $ 217      
Asia Pacific        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery)   171 0 0
Other International        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery)   $ 1 $ 0 $ 0
[1] See Note 3(w) for revisions to comparative results.