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ASSET IMPAIRMENT (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 CAD ($) $ / bbl $ / bbl $ / $ bbl | Dec. 31, 2020 CAD ($) $ / bbl $ / bbl $ / $ bbl | Dec. 31, 2019 CAD ($) $ / bbl $ / t bbl
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Risk adjusted discount rate |  | 7.50% | 7.50%
White Rose |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Increase (decrease) in impairment charge, due to increase in unobservable input | $ | $ 45 |  |
Oil Sands | Fort Hills CGU |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment loss | $ | 1,380 |  | $ 2,800
Taxes on impairment | $ | $ 440 |  | $ 910
Oil price per unit |  | 40.75 | 49.65
Price per barrel escalation percentage | 2.00% | 2.00% |
Share of production per day | bbl | 47,000 |  |
Average cash operating costs per bbl |  |  | 24
Foreign exchanger rate | $ / $ | 0.76 |  |
Risk adjusted discount rate | 7.50% | 7.50% | 7.50%
Recoverable amount of CGU | $ | $ 6,400 | $ 5,700 | $ 7,700
Reasonably possible decrease in unobservable input (as a percent) | 5.00% | 1.00% | 5.00%
Increase (decrease) in impairment charge, due to decrease in unobservable input | $ | $ 1,100 | $ (900) | $ 1,200
Reasonably possible increase in unobservable input (as a percent) | 1.00% | 5.00% | 1.00%
Increase (decrease) in impairment charge, due to increase in unobservable input | $ | $ 1,100 | $ (1,000) | $ 900
Oil Sands | Fort Hills CGU | Minimum |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Share of production per day | bbl | 96,000 |  | 96,000
Average cash operating costs per bbl | 22.00 |  | 22
Cost of carbon compliance | $ / t |  |  | 30
Oil Sands | Fort Hills CGU | Maximum |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Share of production per day | bbl | 106,000 |  | 106,000
Average cash operating costs per bbl | 24.00 |  |
Cost of carbon compliance | $ / t |  |  | 50
Oil Sands | Fort Hills CGU | Remainder of 2020 through 2021 | Minimum |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Average cash operating costs per bbl | 32.00 |  |
Oil Sands | Fort Hills CGU | Remainder of 2020 through 2021 | Maximum |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Average cash operating costs per bbl | 37.00 |  |
Oil Sands | Fort Hills CGU | Remainder of 2020 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Oil price per unit | 9.00 |  |
Oil Sands | Fort Hills CGU | 2021 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Oil price per unit | 13.60 | 32.00 |
Foreign exchanger rate | $ / $ |  | 0.76 |
Oil Sands | Fort Hills CGU | 2021 | Forecast |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Oil price per unit | 40.75 |  |
Oil Sands | Fort Hills CGU | 2022 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Oil price per unit | 32.00 | 41.15 | 45.60
Oil Sands | Fort Hills CGU | 2021 and 2022 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Share of production per day | bbl |  | 74,000 |
Average cash operating costs per bbl |  | 25.50 |
Oil Sands | Fort Hills CGU | After 2022 | Minimum |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Share of production per day | bbl |  | 97,000 |
Average cash operating costs per bbl |  | 19.00 |
Oil Sands | Fort Hills CGU | After 2022 | Maximum |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Share of production per day | bbl |  | 105,000 |
Average cash operating costs per bbl |  | 23.00 |
Oil Sands | Fort Hills CGU | 2023 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Oil price per unit | 51.55 | 47.50 | 49.65
Oil Sands | Fort Hills CGU | 2024 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Oil price per unit | 52.90 | 49.50 | 51.55
Oil Sands | Fort Hills CGU | 2025 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Oil price per unit |  |  | 52.90
Oil Sands | Fort Hills CGU | Thereafter |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Price per barrel escalation percentage |  |  | 2.00%
Oil Sands | Fort Hills CGU | Thereafter 2021 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Foreign exchanger rate | $ / $ |  | 0.80 |
Exploration and Production | Terra Nova |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment loss | $ | $ 285 |  |
Taxes on impairment | $ | $ 93 |  |
Price per barrel escalation percentage | 2.00% |  |
Share of production per day | bbl | 6,200 |  |
Risk adjusted discount rate | 9.00% |  |
Recoverable amount of CGU | $ | $ 24 |  |
Exploration and Production | Terra Nova | Remainder of 2020 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Oil price per unit | 30.00 |  |
Exploration and Production | Terra Nova | 2021 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Oil price per unit | 35.00 |  |
Exploration and Production | Terra Nova | 2022 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Oil price per unit | 50.00 |  |
Exploration and Production | Terra Nova | 2023 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Oil price per unit | 69.00 |  |
Exploration and Production | White Rose |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment loss | $ | $ 137 | $ 423 | $ 393
Taxes on impairment | $ | $ 45 | $ 136 | $ 128
Price per barrel escalation percentage | 2.00% |  | 2.00%
Share of production per day | bbl | 9,800 |  | 8,700
Share of future capital expenditure | $ | $ 1,435 |  | $ 1,400
Risk adjusted discount rate | 9.00% |  | 9.00%
Recoverable amount of CGU | $ | $ 185 |  | $ 360
Reasonably possible decrease in unobservable input (as a percent) | 5.00% |  | 5.00%
Increase (decrease) in impairment charge, due to decrease in unobservable input | $ | $ 83 |  | $ 85
Reasonably possible increase in unobservable input (as a percent) | 1.00% |  | 1.00%
Increase (decrease) in impairment charge, due to increase in unobservable input | $ |  |  | $ 35
Exploration and Production | White Rose | Minimum |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Cost of carbon compliance | $ / t |  |  | 30
Exploration and Production | White Rose | Maximum |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Cost of carbon compliance | $ / t |  |  | 50
Exploration and Production | White Rose | Remainder of 2020 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Oil price per unit | 30.00 |  |
Exploration and Production | White Rose | 2021 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Oil price per unit | 35.00 | 65.00 |
Exploration and Production | White Rose | 2022 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Oil price per unit | 50.00 |  |
Exploration and Production | White Rose | 2023 |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Oil price per unit | 69.00 |  |

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