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Financial Instruments - Summary of Earnings Impact of (Gain) Loss from Risk Management Positions (Detail) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disclosure of detailed information about financial instruments [line items]        
(Gain) Loss on Risk Management $ 283 $ 600 [1] $ 1,568 $ 794 [1]
Realized (Gain) Loss        
Disclosure of detailed information about financial instruments [line items]        
(Gain) Loss on Risk Management 664 199 1,638 541
Unrealized (Gain) Loss on Risk Management        
Disclosure of detailed information about financial instruments [line items]        
(Gain) Loss on Risk Management $ (381) $ 401 $ (70) $ 253
[1] See Note 3 for revisions to prior period results.