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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery)   $ 1,639 $ 276 $ (13)
Deferred Tax Expense (Recovery)   642 452 (838)
Total Tax Expense (Recovery) From Operations   2,281 728 [1] (851) [1]
Canada        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery)   1,252 104 (14)
Deferred Tax Expense (Recovery) $ 106      
United States        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery)   104 0 1
Deferred Tax Expense (Recovery) $ 217      
Asia Pacific        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery)   262 171 0
Other International        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery)   $ 21 $ 1 $ 0
[1] See Note 3X for revisions to prior period results.