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Financial Instruments - Summary of Earnings Impact of (Gain) Loss from Risk Management Positions (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disclosure of detailed information about financial instruments [line items] |  |  |  |
(Gain) Loss on Risk Management | $ 157 | $ 3 | $ 951 | $ 233
Realized (Gain) Loss |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
(Gain) Loss on Risk Management | 184 | 138 | 725 | 226
Unrealized (Gain) Loss |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
(Gain) Loss on Risk Management | $ (27) | $ (135) | $ 226 | $ 7

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