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Impairment Charges and Reversals - Crude Oil and Forward Crack Spreads (Details) | Dec. 31, 2022 $ / bbl | Dec. 31, 2021 $ / bbl | Sep. 30, 2020 $ / barrel
--- | --- | --- | ---
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 to Determine Future Cash Flows | 80.33 |  |
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 to Determine Future Cash Flows | 78.50 |  |
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 to Determine Future Cash Flows | 76.95 |  |
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 to Determine Future Cash Flows | 77.61 |  |
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 to Determine Future Cash Flows | 79.16 |  |
West Texas Intermediate | Not later than two years | Bottom of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | 68.78 | 36.36
West Texas Intermediate | Not later than two years | Top of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | 72.83 | 50.84
West Texas Intermediate | Later than two years and not later than four years | Bottom of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | 66.76 | 49.66
West Texas Intermediate | Later than two years and not later than four years | Top of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | 69.45 | 58.74
WTI-WTS | 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 to Determine Future Cash Flows | (0.56) |  |
WTI-WTS | 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 to Determine Future Cash Flows | (0.56) |  |
WTI-WTS | 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 to Determine Future Cash Flows | (0.56) |  |
WTI-WTS | 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 to Determine Future Cash Flows | (0.56) |  |
WTI-WTS | 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 to Determine Future Cash Flows | (0.56) |  |
WTI-WTS | Not later than two years | Bottom of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | 0 | 0.37
WTI-WTS | Not later than two years | Top of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | 0.01 | 1.73
WTI-WTS | Later than two years and not later than four years | Bottom of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | (0.06) | 1.21
WTI-WTS | Later than two years and not later than four years | Top of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | (0.06) | 1.81
WTI-WCS | 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 to Determine Future Cash Flows | (23.32) |  |
WTI-WCS | 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 to Determine Future Cash Flows | (19.09) |  |
WTI-WCS | 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 to Determine Future Cash Flows | (17.42) |  |
WTI-WCS | 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 to Determine Future Cash Flows | (15.87) |  |
WTI-WCS | 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 to Determine Future Cash Flows | (15.74) |  |
WTI-WCS | Not later than two years | Bottom of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | 13.54 |
WTI-WCS | Not later than two years | Top of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | 13.67 |
WTI-WCS | Later than two years and not later than four years | Bottom of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | 13.75 |
WTI-WCS | Later than two years and not later than four years | Top of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | 14.30 |
Chicago 3-2-1 Crack Spreads (WTI) | 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 to Determine Future Cash Flows | 29.37 |  |
Chicago 3-2-1 Crack Spreads (WTI) | 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 to Determine Future Cash Flows | 24.10 |  |
Chicago 3-2-1 Crack Spreads (WTI) | 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 to Determine Future Cash Flows | 22.12 |  |
Chicago 3-2-1 Crack Spreads (WTI) | 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 to Determine Future Cash Flows | 21.70 |  |
Chicago 3-2-1 Crack Spreads (WTI) | 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 to Determine Future Cash Flows | 21.67 |  |
Chicago 3-2-1 Crack Spreads (WTI) | Not later than two years | Bottom of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | 14.87 |
Chicago 3-2-1 Crack Spreads (WTI) | Not later than two years | Top of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | 18.44 |
Chicago 3-2-1 Crack Spreads (WTI) | Later than two years and not later than four years | Bottom of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | 14.68 |
Chicago 3-2-1 Crack Spreads (WTI) | Later than two years and not later than four years | Top of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows |  | 16.81 |
Group 3 3-2-1 Crack Spreads (WTI) | Not later than two years | Bottom of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows | $ / barrel |  |  | 11.56
Group 3 3-2-1 Crack Spreads (WTI) | Not later than two years | Top of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows | $ / barrel |  |  | 13.23
Group 3 3-2-1 Crack Spreads (WTI) | Later than two years and not later than four years | Bottom of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows | $ / barrel |  |  | 11.79
Group 3 3-2-1 Crack Spreads (WTI) | Later than two years and not later than four years | Top of range |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |
Long-term Price Assumptions Used to Determine Future Cash Flows | $ / barrel |  |  | 16.58

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