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Impairment Charges and Reversals - Crude Oil and Forward Crack Spreads (Details) - $ / bbl
Dec. 31, 2021
Sep. 30, 2020
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 | 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 | 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) | 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 15.33 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 18.97 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 14.82 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 16.98 16.58