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Financial Instruments - Summary of Fair Value Hierarchy for Risk Management Assets and Liabilities Carried at Fair Value (Detail) - CAD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Disclosure Of Levels Of Fair Value Hierarchy [Line Items]    
Fair value of derivative financial instruments net $ 1 $ (68)
Level 2 of fair value hierarchy    
Disclosure Of Levels Of Fair Value Hierarchy [Line Items]    
Fair value of derivative financial instruments 2 (68)
Level 3 of fair value hierarchy    
Disclosure Of Levels Of Fair Value Hierarchy [Line Items]    
Fair value of derivative financial instruments $ (1) $ 0