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Impairment Charges and Reversals - Summary of Impairment Losses and Estimated Recoverable Amounts (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Recoverable Amount | $ 2,000 |
Clearwater |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Reversal of Impairment | 145 |
Recoverable Amount | 427 | $ 160
Impairment |  | 260
Elmworth-Wapiti |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Reversal of Impairment | 115 |
Recoverable Amount | 747 | 259
Impairment |  | 120
Kaybob-Edson |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Reversal of Impairment | 118 |
Recoverable Amount | $ 837 | 384
Impairment |  | $ 175

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