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Financial Instruments - Summary of Earnings Impact of (Gain) Loss from Risk Management Positions (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
(Gain) Loss on Risk Management | $ 995 | $ 308 | [1] | $ 156 | [1]
Realized (Gain) Loss |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
(Gain) Loss on Risk Management | 993 | 252 |  | 7 |
Unrealized (Gain) Loss |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
(Gain) Loss on Risk Management | $ 2 | $ 56 |  | $ 149 |
[1] | See Note 3(w) for revisions to comparative results.

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