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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, 2019 | Dec. 31, 2018
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Asset impairments | $ (2,690) | $ (41)
Frontier oil sands project |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Asset impairments | (1,129) | 0
Fort Hills CGU |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Asset impairments | (1,241) | 0
Steelmaking coal CGU |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Asset impairments | (289) | 0
Other |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Asset impairments | $ (31) | $ (41)

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