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Asset and Goodwill Impairment Testing - Summary of Pre-tax Impairment Reversal and (Asset Impairments) Recorded in Statement of Income (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Asset impairments | $ 1,244 | $ 2,690
Frontier oil sands project |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Asset impairments | 0 | 1,129
Fort Hills CGU |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Asset impairments | 1,244 | 1,241
Steelmaking coal CGU |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Asset impairments | 0 | 289
Other |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Asset impairments | $ 0 | $ 31

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