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Impairment Charges and Reversals - Summary of Forward Prices Used to Determine Future Cash Flows (Detail) - Upstream Commodity Price Assumptions [Member]
Dec. 31, 2020
$ / bbl
$ / bbl
$ / Mcf
WTI [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%
WTI [Member] | 2021 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price 47.17
WTI [Member] | 2022 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price 50.17
WTI [Member] | 2023 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price 53.17
WTI [Member] | 2024 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price 54.97
WTI [Member] | 2025 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price 56.07
WCS [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%
WCS [Member] | 2021 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price 44.63
WCS [Member] | 2022 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price 48.18
WCS [Member] | 2023 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price 52.10
WCS [Member] | 2024 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price 54.10
WCS [Member] | 2025 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price 55.19
Edmonton C5+ [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%
Edmonton C5+ [Member] | 2021 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price 59.24
Edmonton C5+ [Member] | 2022 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price 63.19
Edmonton C5+ [Member] | 2023 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price 67.34
Edmonton C5+ [Member] | 2024 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price 69.77
Edmonton C5+ [Member] | 2025 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price 71.18
AECO [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%
AECO [Member] | 2021 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price | $ / Mcf 2.88
AECO [Member] | 2022 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price | $ / Mcf 2.80
AECO [Member] | 2023 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price | $ / Mcf 2.71
AECO [Member] | 2024 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price | $ / Mcf 2.75
AECO [Member] | 2025 [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Average Price | $ / Mcf 2.80