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Debt and Capital Structure - Schedule of Long-Term Debt (Detail)
$ in Millions, $ in Billions
Dec. 31, 2021
CAD ($)
Jan. 01, 2021
CAD ($)
Jan. 01, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Disclosure of detailed information about borrowings [line items]        
Net Debt Premiums (Discounts) and Transaction Costs $ 272     $ (69)
Long-Term Debt 12,385     7,441
Long-Term Portion 12,385     7,441
The Arrangement        
Disclosure of detailed information about borrowings [line items]        
Debt premiums   $ 353    
U.S. Dollar Denominated Unsecured Notes | The Arrangement        
Disclosure of detailed information about borrowings [line items]        
Long-Term Debt   $ 3,000 $ 2.4  
Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 12,113     7,510
Long-Term Debt | Revolving Term Debt        
Disclosure of detailed information about borrowings [line items]        
Revolving Term Debt 0     0
Long-Term Debt | Canadian Dollar Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 2,750     0
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) $ 9,363     $ 7,510