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Income Taxes - Additional Information (Detail) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2021
Disclosure of income taxes [line items]            
Deferred Income Taxes $ 694 $ 694 $ 36     $ 1,100
Canadian Statutory Tax Rate   23.70% 24.00% 26.50%    
Deferred tax (expense) recovery   $ 0 $ 0 $ 387    
Deferred income tax assets has been recognized     36      
Amounts of tax pools available, including tax losses 17,682 17,682 9,657      
Deferred Tax Expense (Recovery)   452 (838) (814)    
Canadian Federal Non Capital Losses            
Disclosure of income taxes [line items]            
Amounts of tax pools available, including tax losses 1,500 1,500 1,700      
US Federal Net Operating Losses            
Disclosure of income taxes [line items]            
Amounts of tax pools available, including tax losses 775 775 1,100      
Canadian Net Capital Losses            
Disclosure of income taxes [line items]            
Amounts of tax pools available, including tax losses 102 102 85      
Net capital losses associated with unrealized foreign exchange losses   102 254      
Internal Restructuring            
Disclosure of income taxes [line items]            
Deferred tax (expense) recovery       $ 387    
Canada            
Disclosure of income taxes [line items]            
Deferred Income Taxes           1,100
Amounts of tax pools available, including tax losses 11,167 11,167 6,540      
Deferred Tax Expense (Recovery) 106          
United States            
Disclosure of income taxes [line items]            
Deferred Income Taxes           359
Amounts of tax pools available, including tax losses 5,915 5,915 3,117      
Deferred Tax Expense (Recovery) 217          
Asia Pacific            
Disclosure of income taxes [line items]            
Deferred Income Taxes           $ (444)
Amounts of tax pools available, including tax losses $ 600 $ 600 $ 0      
Alberta            
Disclosure of income taxes [line items]            
Canadian Statutory Tax Rate     8.00% 8.00% 12.00%  
Deferred tax (expense) recovery       $ 671