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Asset and Goodwill Impairment Testing - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 CAD ($) | Mar. 31, 2020 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2020 $ / shares | Dec. 31, 2020 $ / shares | Oct. 31, 2019 CAD ($)
Fort Hills CGU |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |
Impairment loss recognised in profit or loss | $ 597 | $ 647 | $ 1,200 | $ 1,200 |  |  |
Impairment loss recognised in profit or loss, after tax | 438 | $ 474 |  | 910 |  |  |
Recoverable amount net of tax | 2,100 |  | $ 2,100 | 3,100 |  |  |
Steelmaking coal CGU |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |
Impairment loss recognised in profit or loss |  |  |  | 289 |  |  |
Impairment loss recognised in profit or loss, after tax |  |  |  | 184 |  |  |
Recoverable amount of steelmaking coal CGU exceeding its carrying value |  |  |  |  |  |  | $ 2,100
Change in the price of dollar that would result in equalization of carrying value and fair value |  |  |  |  |  |  | 5.00%
Other |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |
Impairment loss recognised in profit or loss |  |  |  | $ 31 |  |  |
Bottom of range | Steelmaking coal CGU |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |
Useful life |  |  | 14 years |  |  |  |
Top of range | Steelmaking coal CGU |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |
Useful life |  |  | 50 years |  |  |  |
Quebrada Blanca | Other |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |
Useful life |  |  | 28 years |  |  |  |
Quebrada Blanca | Projected expansion |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |
Useful life |  |  | 42 years |  |  |  |
Mine Plans | Fort Hills CGU |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |
Useful life |  |  | 45 years | 40 years |  |  |
WCS Oil | Fort Hills CGU |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |
Decrease in assumption |  |  |  |  | 1 | 0.01 |
Amount by which recoverable amount is reduced when key assumption changes for commodity price | 100 |  | $ 100 |  |  |  |
Amount by which recoverable amount is reduced when key assumption changes for foreign exchange rate | 30 |  | $ 30 |  |  |  |
Adjustment to interest rate basis |  |  | 2500.00% |  |  |  |
Amount by which recoverable amount is reduced when key assumption changes for discount rate | $ 60 |  | $ 60 |  |  |  |
Frontier oil sands project |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |
Impairment loss recognised in profit or loss |  |  |  | $ 1,100 |  |  |
Impairment loss recognised in profit or loss, after tax |  |  |  | $ 944 |  |  |

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