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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.

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