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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%