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Financial Instruments - Summary of Earnings Impact of (Gain) Loss from Risk Management Positions (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
(Gain) Loss on Risk Management $ 58 $ 61
Realized (Gain) Loss    
Disclosure of detailed information about financial instruments [line items]    
(Gain) Loss on Risk Management 46 9
Unrealized (Gain) Loss    
Disclosure of detailed information about financial instruments [line items]    
(Gain) Loss on Risk Management $ 12 $ 52