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v3.19.3.a.u2

Asset and Goodwill Impairment Testing - Additional Information (Detail) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2019 $ / shares | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 $ / shares | Oct. 31, 2019 CAD ($)
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Percentage of discount rate applied to cash flow projections |  | 6.00% |  |  |  |
Fort Hills CGU |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Impairment loss recognised in profit or loss | $ 1,200 |  |  |  |  |
Impairment loss recognised in profit or loss, after tax | 910 |  |  |  |  |
Recoverable amount net of tax |  |  |  | $ 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 |  |  |  |  |  | $ 4,800
Change in the price of dollar that would result in equalization of carrying value and fair value |  |  |  |  |  | 10.00%
Other |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Impairment loss recognised in profit or loss | $ 31 | $ 41 |  |  |  |
Other | Capitalized exploration expenditures |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Impairment loss recognised in profit or loss |  | 31 |  |  |  |
Bottom of range |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Percentage of discount rate applied to cash flow projections | 5.40% |  |  |  |  |
Bottom of range | Steelmaking coal CGU |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Useful life | 1 year |  |  |  |  |
Top of range |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Percentage of discount rate applied to cash flow projections | 6.00% |  |  |  |  |
Top of range | Steelmaking coal CGU |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Useful life | 50 years |  |  |  |  |
Quebrada Blanca |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Recoverable amount of steelmaking coal CGU exceeding its carrying value |  |  |  |  |  | $ 798
Change in the price of dollar that would result in equalization of carrying value and fair value |  |  |  |  |  | 5.00%
Quebrada Blanca | Other |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Impairment loss recognised in profit or loss |  | $ 10 |  |  |  |
Useful life | 30 years |  |  |  |  |
Mine Plans | Fort Hills CGU |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Useful life | 40 years |  |  |  |  |
Mining Operations and Goodwill |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Percentage of discount rate applied to cash flow projections | 6.00% | 6.00% |  |  |  |
Discount rate, nominal post-tax | 8.10% | 8.10% |  |  |  |
Oil Sands Operations |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Percentage of discount rate applied to cash flow projections | 5.40% |  |  |  |  |
Discount rate, nominal post-tax | 7.50% |  |  |  |  |
WCS Oil | Fort Hills CGU |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Decrease in assumption |  |  | 0.01 |  | 1 |
Amount by which recoverable amount is reduced when key assumption changes for commodity price |  |  |  | 135 |  |
Amount by which recoverable amount is reduced when key assumption changes for foreign exchange rate |  |  |  | 50 |  |
Adjustment to interest rate basis | 2500.00% |  |  |  |  |
Amount by which recoverable amount is reduced when key assumption changes for discount rate |  |  |  | $ 110 |  |
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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