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Oil and Gas Properties - Recoverable Amount Of Company CGUs (Details) - Company's CGUs | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 usdPerGigajoules $ / $ cadPerBbl usdPerBbl cadPerGigajoules | Dec. 31, 2020 usdPerGigajoules cadPerBbl cadPerGigajoules usdPerBbl $ / $
2020 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Average foreign exchange rate (in dollars per share) | $ / $ | 1.41 | 1.30
2021 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Average foreign exchange rate (in dollars per share) | $ / $ | 1.37 | 1.31
2022 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Average foreign exchange rate (in dollars per share) | $ / $ | 1.34 | 1.31
2023 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Average foreign exchange rate (in dollars per share) | $ / $ | 1.34 | 1.31
2024 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Average foreign exchange rate (in dollars per share) | $ / $ | 1.34 | 1.31
2025 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Average foreign exchange rate (in dollars per share) | $ / $ | 1.33 | 1.31
2026 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Average foreign exchange rate (in dollars per share) | $ / $ | 1.33 | 1.31
2027 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Average foreign exchange rate (in dollars per share) | $ / $ | 1.33 | 1.31
2028 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Average foreign exchange rate (in dollars per share) | $ / $ | 1.33 | 1.31
2029 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Average foreign exchange rate (in dollars per share) | $ / $ | 1.33 | 1.31
WTI | Oil reserves | 2020 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 29.17 | 47.17
WTI | Oil reserves | 2021 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 40.45 | 50.17
WTI | Oil reserves | 2022 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 49.17 | 53.17
WTI | Oil reserves | 2023 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 53.28 | 54.97
WTI | Oil reserves | 2024 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 55.66 | 56.07
WTI | Oil reserves | 2025 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 56.87 | 57.19
WTI | Oil reserves | 2026 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 58.01 | 58.34
WTI | Oil reserves | 2027 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 59.17 | 59.50
WTI | Oil reserves | 2028 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 60.35 | 60.69
WTI | Oil reserves | 2029 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 61.56 | 61.91
WCS | Oil reserves | 2020 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 19.21 | 44.63
WCS | Oil reserves | 2021 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 34.65 | 48.18
WCS | Oil reserves | 2022 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 46.34 | 52.10
WCS | Oil reserves | 2023 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 51.25 | 54.10
WCS | Oil reserves | 2024 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 54.28 | 55.19
WCS | Oil reserves | 2025 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 55.72 | 56.29
WCS | Oil reserves | 2026 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 56.96 | 57.42
WCS | Oil reserves | 2027 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 58.22 | 58.57
WCS | Oil reserves | 2028 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 59.51 | 59.74
WCS | Oil reserves | 2029 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 60.82 | 60.93
LLS | Oil reserves | 2020 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 32.17 | 49.50
LLS | Oil reserves | 2021 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 43.80 | 52.85
LLS | Oil reserves | 2022 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 52.55 | 55.87
LLS | Oil reserves | 2023 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 56.68 | 57.69
LLS | Oil reserves | 2024 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 59.10 | 58.82
LLS | Oil reserves | 2025 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 60.35 | 59.97
LLS | Oil reserves | 2026 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 61.52 | 61.15
LLS | Oil reserves | 2027 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 62.72 | 62.34
LLS | Oil reserves | 2028 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 63.94 | 63.56
LLS | Oil reserves | 2029 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerBbl | 65.19 | 64.83
Edmonton Par | Oil reserves | 2020 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 29.22 | 55.76
Edmonton Par | Oil reserves | 2021 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 46.85 | 59.89
Edmonton Par | Oil reserves | 2022 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 59.27 | 63.48
Edmonton Par | Oil reserves | 2023 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 65.02 | 65.76
Edmonton Par | Oil reserves | 2024 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 68.43 | 67.13
Edmonton Par | Oil reserves | 2025 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 69.81 | 68.53
Edmonton Par | Oil reserves | 2026 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 71.24 | 69.95
Edmonton Par | Oil reserves | 2027 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 72.70 | 71.40
Edmonton Par | Oil reserves | 2028 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 74.19 | 72.88
Edmonton Par | Oil reserves | 2029 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerBbl | 75.71 | 74.34
Henry Hub | Oil reserves | 2020 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules |  | 2.83
Henry Hub | Oil reserves | 2021 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules |  | 2.87
Henry Hub | Oil reserves | 2022 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules |  | 2.90
Henry Hub | Oil reserves | 2023 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules |  | 2.96
Henry Hub | Oil reserves | 2024 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules |  | 3.02
Henry Hub | Oil reserves | 2025 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules |  | 3.08
Henry Hub | Oil reserves | 2026 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules |  | 3.14
Henry Hub | Oil reserves | 2027 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules |  | 3.20
Henry Hub | Oil reserves | 2028 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules |  | 3.26
Henry Hub | Oil reserves | 2029 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules |  | 3.33
Henry Hub | Natural gas reserves | 2020 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules | 2.10 |
Henry Hub | Natural gas reserves | 2021 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules | 2.58 |
Henry Hub | Natural gas reserves | 2022 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules | 2.79 |
Henry Hub | Natural gas reserves | 2023 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules | 2.86 |
Henry Hub | Natural gas reserves | 2024 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules | 2.93 |
Henry Hub | Natural gas reserves | 2025 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules | 3.00 |
Henry Hub | Natural gas reserves | 2026 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules | 3.07 |
Henry Hub | Natural gas reserves | 2027 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules | 3.13 |
Henry Hub | Natural gas reserves | 2028 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules | 3.19 |
Henry Hub | Natural gas reserves | 2029 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | usdPerGigajoules | 3.25 |
AECO | Natural gas reserves | 2020 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerGigajoules | 1.74 | 2.78
AECO | Natural gas reserves | 2021 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerGigajoules | 2.20 | 2.70
AECO | Natural gas reserves | 2022 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerGigajoules | 2.38 | 2.61
AECO | Natural gas reserves | 2023 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerGigajoules | 2.45 | 2.65
AECO | Natural gas reserves | 2024 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerGigajoules | 2.53 | 2.70
AECO | Natural gas reserves | 2025 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerGigajoules | 2.60 | 2.76
AECO | Natural gas reserves | 2026 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerGigajoules | 2.66 | 2.81
AECO | Natural gas reserves | 2027 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerGigajoules | 2.72 | 2.87
AECO | Natural gas reserves | 2028 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerGigajoules | 2.79 | 2.92
AECO | Natural gas reserves | 2029 |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Commodity sales price | cadPerGigajoules | 2.85 | 2.98

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