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Share Based Compensation - Share Unit Plans (Details)
$ / shares in Units, shares in Thousands, EquityInstruments in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2023
EquityInstruments
shares
Dec. 31, 2022
CAD ($)
EquityInstruments
shares
$ / shares
Performance Share Units (PSUs)    
Share Based Compensation    
Vesting period 3 years  
Summary of activity of share unit plans:    
Outstanding, beginning of year 2,209 2,766
Granted 814 947
Redeemed for cash (436) (794)
Forfeited/expired | shares (273) (710)
Outstanding, end of year 2,314 2,209
Performance Share Units (PSUs) | Minimum    
Share Based Compensation    
Percentage of share price receivable at the time of vesting 0.00%  
Performance Share Units (PSUs) | Maximum    
Share Based Compensation    
Percentage of share price receivable at the time of vesting 200.00%  
Restricted Stock Units (RSUs)    
Share Based Compensation    
Vesting period 3 years  
Value of shares converted to Suncor RSUs | $   $ 123
Conversion price per share | $ / shares   $ 30.93
Summary of activity of share unit plans:    
Outstanding, beginning of year 28,262 21,437
Granted 9,006 13,235
Redeemed for cash (7,582) (4,533)
Forfeited/expired | shares (3,156) (1,877)
Outstanding, end of year 26,530 28,262
Deferred Share Units (DSUs)    
Summary of activity of share unit plans:    
Outstanding, beginning of year 1,331 1,382
Granted 299 187
Redeemed for cash (461) (238)
Outstanding, end of year 1,169 1,331
Deferred Share Units (DSUs) | Director | Election Tranche One    
Share Based Compensation    
Percentage of awards elected to be paid in cash 50.00%  
Deferred Share Units (DSUs) | Director | Election Tranche Two    
Share Based Compensation    
Percentage of awards elected to be paid in cash 100.00%  
Deferred Share Units (DSUs) | Executives | Election Tranche One    
Share Based Compensation    
Percentage of awards elected to be paid in cash 25.00%  
Deferred Share Units (DSUs) | Executives | Election Tranche Two    
Share Based Compensation    
Percentage of awards elected to be paid in cash 50.00%  
Deferred Share Units (DSUs) | Executives | Election Tranche Three    
Share Based Compensation    
Percentage of awards elected to be paid in cash 75.00%  
Deferred Share Units (DSUs) | Executives | Election Tranche Four    
Share Based Compensation    
Percentage of awards elected to be paid in cash 100.00%