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Joint Arrangements - Joint Operations (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Fenja Development JV | Norway          
JOINT ARRANGEMENTS          
Ownership interest sold (as percent)   17.50%      
Oda | Norway          
JOINT ARRANGEMENTS          
Ownership interest sold (as percent)   30.00%      
Oil Sands | Operated by Suncor | Fort Hills Energy Limited Partnership          
JOINT ARRANGEMENTS          
Country of Incorporation and Principal Place of Business       Canada Canada
Ownership interest (as percent) 68.76%     54.11% 54.11%
Additional interest acquired (as a percent) 14.65%        
Oil Sands | Operated by Suncor | Meadow Creek          
JOINT ARRANGEMENTS          
Country of Incorporation and Principal Place of Business       Canada Canada
Ownership interest (as percent)       75.00% 75.00%
Oil Sands | Operated by Suncor | Syncrude          
JOINT ARRANGEMENTS          
Country of Incorporation and Principal Place of Business       Canada Canada
Ownership interest (as percent)       58.74% 58.74%
Exploration and Production | White Rose Extensions          
JOINT ARRANGEMENTS          
Ownership interest (as percent)     40.00%    
Additional interest acquired (as a percent)     12.50%    
Exploration and Production | Operated by Suncor | Terra Nova          
JOINT ARRANGEMENTS          
Country of Incorporation and Principal Place of Business       Canada Canada
Ownership interest (as percent)       48.00% 48.00%
Exploration and Production | Non-operated | Buzzard          
JOINT ARRANGEMENTS          
Country of Incorporation and Principal Place of Business       United Kingdom United Kingdom
Ownership interest (as percent)       29.89% 29.89%
Exploration and Production | Non-operated | Fenja Development JV          
JOINT ARRANGEMENTS          
Country of Incorporation and Principal Place of Business         Norway
Ownership interest (as percent)         17.50%
Exploration and Production | Non-operated | Hibernia and the Hibernia South Extension Unit          
JOINT ARRANGEMENTS          
Country of Incorporation and Principal Place of Business       Canada Canada
Exploration and Production | Non-operated | Hibernia          
JOINT ARRANGEMENTS          
Ownership interest (as percent)       19.48% 19.48%
Exploration and Production | Non-operated | Hibernia South Extension Unit          
JOINT ARRANGEMENTS          
Ownership interest (as percent)       20.00% 20.00%
Exploration and Production | Non-operated | Hebron          
JOINT ARRANGEMENTS          
Country of Incorporation and Principal Place of Business       Canada Canada
Ownership interest (as percent)       21.03% 21.03%
Exploration and Production | Non-operated | Harouge Oil Operations          
JOINT ARRANGEMENTS          
Country of Incorporation and Principal Place of Business       Libya Libya
Ownership interest (as percent)       49.00% 49.00%
Exploration and Production | Non-operated | North Sea Rosebank Project          
JOINT ARRANGEMENTS          
Country of Incorporation and Principal Place of Business       United Kingdom United Kingdom
Ownership interest (as percent)       40.00% 40.00%
Exploration and Production | Non-operated | Oda          
JOINT ARRANGEMENTS          
Country of Incorporation and Principal Place of Business         Norway
Ownership interest (as percent)         30.00%
Exploration and Production | Non-operated | White Rose and the White Rose Extensions          
JOINT ARRANGEMENTS          
Country of Incorporation and Principal Place of Business       Canada Canada
Exploration and Production | Non-operated | White Rose          
JOINT ARRANGEMENTS          
Ownership interest (as percent)       38.625% 26.13%
Exploration and Production | Non-operated | White Rose Extensions          
JOINT ARRANGEMENTS          
Ownership interest (as percent)       40.00% 27.50%