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v3.20.4

Impairment Charges and Reversals - Additional Information (Detail) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 CAD ($) | Sep. 30, 2020 CAD ($) $ / bbl | Mar. 31, 2020 CAD ($) | Dec. 31, 2020 CAD ($) | Mar. 31, 2020 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($)
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairments |  |  |  |  | $ 0 |  | $ 0 | $ 0 |  |
Exploration Expense |  |  |  |  |  |  | 91,000,000 | 82,000,000 | $ 2,123,000,000 |
E&E Asset [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Exploration Expense |  |  |  |  |  |  | $ 91,000,000 | 82,000,000 |  |
PP&E [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
CGU Impairments |  |  |  |  |  |  |  | 52,000,000 |  |
Discounted Cash Flow [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Discounted future cash flows, discount rate | 10.00% |  |  | 10.00% |  |  | 10.00% |  |  |
Discounted future cash flows, inflation rate | 2.00% |  |  | 2.00% |  |  | 2.00% |  |  |
Refining Commodity Price Assumptions [Member] | 2035 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Average Annual Increase Thereafter |  | 2.00% |  |  |  |  |  |  |  |
Bottom of Range [Member] | Discounted Cash Flow [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Discounted future cash flows, discount rate | 10.00% |  |  | 10.00% |  |  | 10.00% |  |  |
Top of Range [Member] | Discounted Cash Flow [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Discounted future cash flows, discount rate | 15.00% |  |  | 15.00% |  |  | 15.00% |  |  |
CGUs [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
CGU Impairments |  |  |  |  |  |  |  | 0 | 0 |
Borger Cash Generating Unit [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Recoverable amount |  | $ 692,000,000 |  |  |  |  |  |  |  |
Wood River Cash Generating Units |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
CGU Impairments | $ 0 | $ 0 |  |  |  |  |  |  |  |
WTI to West Texas Sour [Member] | Bottom of Range [Member] | Refining Commodity Price Assumptions [Member] | 2021 to 2022 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Average Price | $ / bbl |  | 36.36 |  |  |  |  |  |  |  |
WTI to West Texas Sour [Member] | Bottom of Range [Member] | Refining Commodity Price Assumptions [Member] | 2023 to 2025 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Average Price | $ / bbl |  | 49.66 |  |  |  |  |  |  |  |
WTI to West Texas Sour [Member] | Top of Range [Member] | Refining Commodity Price Assumptions [Member] | 2021 to 2022 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Average Price | $ / bbl |  | 50.84 |  |  |  |  |  |  |  |
WTI to West Texas Sour [Member] | Top of Range [Member] | Refining Commodity Price Assumptions [Member] | 2023 to 2025 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Average Price | $ / bbl |  | 58.74 |  |  |  |  |  |  |  |
WTI to West Texas Sour DIFFERENTIAL [Member] | Bottom of Range [Member] | Refining Commodity Price Assumptions [Member] | 2021 to 2022 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Average Price | $ / bbl |  | 0.37 |  |  |  |  |  |  |  |
WTI to West Texas Sour DIFFERENTIAL [Member] | Bottom of Range [Member] | Refining Commodity Price Assumptions [Member] | 2023 to 2025 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Average Price | $ / bbl |  | 1.21 |  |  |  |  |  |  |  |
WTI to West Texas Sour DIFFERENTIAL [Member] | Top of Range [Member] | Refining Commodity Price Assumptions [Member] | 2021 to 2022 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Average Price | $ / bbl |  | 1.73 |  |  |  |  |  |  |  |
WTI to West Texas Sour DIFFERENTIAL [Member] | Top of Range [Member] | Refining Commodity Price Assumptions [Member] | 2023 to 2025 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Average Price | $ / bbl |  | 1.81 |  |  |  |  |  |  |  |
Group 3 Forward Market Crack Spread [Member] | Bottom of Range [Member] | Refining Commodity Price Assumptions [Member] | 2021 to 2022 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Average Price | $ / bbl |  | 11.56 |  |  |  |  |  |  |  |
Group 3 Forward Market Crack Spread [Member] | Bottom of Range [Member] | Refining Commodity Price Assumptions [Member] | 2023 to 2025 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Average Price | $ / bbl |  | 11.79 |  |  |  |  |  |  |  |
Group 3 Forward Market Crack Spread [Member] | Top of Range [Member] | Refining Commodity Price Assumptions [Member] | 2021 to 2022 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Average Price | $ / bbl |  | 13.23 |  |  |  |  |  |  |  |
Group 3 Forward Market Crack Spread [Member] | Top of Range [Member] | Refining Commodity Price Assumptions [Member] | 2023 to 2025 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Average Price | $ / bbl |  | 16.58 |  |  |  |  |  |  |  |
Railcar CGUs [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
CGU Impairments |  |  | $ 3,000,000 |  |  |  |  |  |  |
Conventional [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Exploration Expense |  |  |  |  |  |  | $ 82,000,000 | 64,000,000 | 2,117,000,000 |
Conventional [Member] | E&E Asset [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Exploration Expense |  |  |  |  |  |  | 82,000,000 | 64,000,000 | 2,100,000,000 |
Conventional [Member] | PP&E [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
CGU Impairments |  |  |  |  |  |  | 4,000,000 |  |  |
Conventional [Member] | Clearwater CGU [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
CGU Impairments |  |  |  |  |  |  |  |  | 100,000,000 | $ 56,000,000
Recoverable amount |  |  |  |  |  | $ 761,000,000 |  |  | 761,000,000 |
Reversed of impairment loss |  |  |  |  |  | $ 132,000,000 |  |  |  |
Conventional [Member] | CGUs [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
CGU Impairments |  |  |  | $ 240,000,000 | $ 315,000,000 |  |  |  |  |
Refining and Marketing [Member] | Borger Cash Generating Unit [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
CGU Impairments |  | $ 450,000,000 |  |  |  |  |  |  |  |
Oil Sands [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Exploration Expense |  |  |  |  |  |  | 9,000,000 | 18,000,000 | $ 6,000,000 |
Oil Sands [Member] | E&E Asset [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Exploration Expense |  |  |  |  |  |  | 9,000,000 | $ 18,000,000 |  |
Oil Sands [Member] | PP&E [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items] |  |  |  |  |  |  |  |  |  |
CGU Impairments |  |  |  |  |  |  | $ 48,000,000 |  |  |

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