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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
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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

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