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Income Taxes - Additional Information (Detail) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2018
Jan. 01, 2021
Disclosure of income taxes [line items]            
Deferred Tax Expense (Recovery)   $ 642 $ 452 $ (838)    
Canadian statutory tax rate   23.70% 23.70% 24.00%    
Deferred Income Taxes $ 694 $ 546 $ 694     $ 1,100
Amounts of tax pools available, including tax losses 17,682 15,439 17,682      
Sunrise            
Disclosure of income taxes [line items]            
Deferred Income Taxes   (486)        
Canadian Federal Non Capital Losses            
Disclosure of income taxes [line items]            
Amounts of tax pools available, including tax losses 1,500 115 1,500      
US Federal Net Operating Losses            
Disclosure of income taxes [line items]            
Amounts of tax pools available, including tax losses 775 468 775      
Canadian Net Capital Losses            
Disclosure of income taxes [line items]            
Amounts of tax pools available, including tax losses 102 28 102      
Net capital losses associated with unrealized foreign exchange losses   504 102      
United States            
Disclosure of income taxes [line items]            
Deferred Tax Expense (Recovery) 217          
Deferred Income Taxes           359
Amounts of tax pools available, including tax losses 5,915 6,477 5,915      
Canada            
Disclosure of income taxes [line items]            
Deferred Tax Expense (Recovery) 106          
Deferred Income Taxes           1,100
Amounts of tax pools available, including tax losses 11,167 8,505 11,167      
Alberta            
Disclosure of income taxes [line items]            
Canadian statutory tax rate       8.00% 12.00%  
Asia Pacific            
Disclosure of income taxes [line items]            
Deferred Income Taxes           $ (444)
Amounts of tax pools available, including tax losses $ 600 $ 457 $ 600