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Asset and Goodwill Impairment Testing - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($) | Mar. 31, 2020 CAD ($) | Dec. 31, 2021 CAD ($) $ / bbl | Dec. 31, 2020 CAD ($) $ / bbl | Dec. 31, 2021 USD ($)
Discount rate |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Change in Assumption | 1.00% | 1.00% |  | 1.00% | 1.00% | 1.00%
Canada, Dollars |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Long-term foreign exchange rates |  |  |  | 1.28 | 1.30 |
Carmen de Andacollo CGU |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Reversal of impairment loss | $ 215 |  |  |  |  |
Reversal of impairment loss, net | $ 150 |  |  |  |  |
Fort Hills CGU |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Post-tax real discount rates | 8.00% |  |  | 8.00% |  | 8.00%
Recoverable amount net of tax | $ 2,100 | $ 2,100 |  | $ 2,100 | $ 2,100 |
Impairment loss recognised in profit or loss |  | 597 | $ 647 |  | $ 1,200 |
Impairment loss recognised in profit or loss, after tax |  | $ 438 | $ 474 |  |  |
Fort Hills CGU | Discount rate |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Reasonably possible increase in recoverable amount based on changes in the actuarial assumption | $ 50 |  |  | $ 50 |  |
Change in Assumption | 0.25% |  |  | 0.25% |  | 0.25%
Fort Hills CGU | Canada, Dollars |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Long-term foreign exchange rates |  |  |  | 1.28 |  |
Fort Hills CGU | Canada, Dollars | Actuarial assumption of expected rates changes of foreign exchange rates |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Reasonably possible increase in recoverable amount based on changes in the actuarial assumption | $ 30 |  |  | $ 30 |  |
Reasonably possible increase in actuarial assumption of exchange rates |  |  |  |  |  | $ 0.01
Bottom of range |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Post-tax real discount rates | 600.00% | 600.00% |  | 600.00% | 600.00% | 600.00%
Bottom of range | Steelmaking Coal Cash Generating Unit |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Useful life |  |  |  | 14 years |  |
Top of range |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Post-tax real discount rates | 800.00% | 800.00% |  | 800.00% | 800.00% | 800.00%
Top of range | Steelmaking Coal Cash Generating Unit |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Useful life |  |  |  | 50 years |  |
Quebrada Blanca | QB2 |  |  |  |  |  |
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 |  |  |  | 37 years | 45 years |
WCS Heavy Oil |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Future commodity price used in cash flow projections | $ / bbl |  |  |  | 48 | 46 |
WCS Heavy Oil | Fort Hills CGU |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Future commodity price used in cash flow projections | $ / bbl |  |  |  | 48 |  |
WCS Heavy Oil | Fort Hills CGU | Actuarial assumptions of recovery rates based on the change in heavy oil prices |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |
Reasonably possible increase in actuarial assumption of heavy oil price |  |  |  |  |  | $ 1
Reasonably possible increase in recoverable amount based on changes in the actuarial assumption | $ 100 |  |  | $ 100 |  |

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