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Impairment Charges and Reversals - Forward Price Assumptions (Details) BTU in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 $ / Mcf BTU $ / bbl $ / bbl | Dec. 31, 2020 $ / bbl $ / bbl $ / Mcf BTU
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Gas Heating Value | BTU | 1 | 1
West Texas Intermediate | 1 Year |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | 72.83 | 47.17
West Texas Intermediate | 2 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | 68.78 | 50.17
West Texas Intermediate | 3 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | 66.76 | 53.17
West Texas Intermediate | 4 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | 68.09 | 54.97
West Texas Intermediate | 5 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | 69.45 | 56.07
West Texas Intermediate | Thereafter |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Forward price, average annual increase | 2.00% | 2.00%
Western Canada Select | 1 Year |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | 74.43 | 44.63
Western Canada Select | 2 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | 69.17 | 48.18
Western Canada Select | 3 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | 66.54 | 52.10
Western Canada Select | 4 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | 67.87 | 54.10
Western Canada Select | 5 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | 69.23 | 55.19
Western Canada Select | Thereafter |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Forward price, average annual increase | 2.00% | 2.00%
Edmonton C5+ | 1 Year |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | 91.85 | 59.24
Edmonton C5+ | 2 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | 85.53 | 63.19
Edmonton C5+ | 3 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | 82.98 | 67.34
Edmonton C5+ | 4 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | 84.63 | 69.77
Edmonton C5+ | 5 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | 86.33 | 71.18
Edmonton C5+ | Thereafter |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Forward price, average annual increase | 2.00% | 2.00%
Alberta Energy Company Natural Gas | 1 Year |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | $ / Mcf | 3.56 | 2.88
Alberta Energy Company Natural Gas | 2 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | $ / Mcf | 3.20 | 2.80
Alberta Energy Company Natural Gas | 3 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | $ / Mcf | 3.05 | 2.71
Alberta Energy Company Natural Gas | 4 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | $ / Mcf | 3.10 | 2.75
Alberta Energy Company Natural Gas | 5 Years |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Long-term Price Assumptions Used In Current Measurement Of Fair Value Less Costs Of Disposal | $ / Mcf | 3.17 | 2.80
Alberta Energy Company Natural Gas | Thereafter |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Forward price, average annual increase | 2.00% | 2.00%

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