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Summary of Significant Accounting Policies - Revisions to Prior Periods (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Gross Sales $ 71,765 $ 48,811 [1] $ 13,914 [1]
Purchased Product 33,801 23,326 [1] 5,681 [1]
Operating 5,569 4,716 [1] 1,955 [1]
Transportation and Blending 11,530 8,038 [1] 4,728 [1]
Depreciation, Depletion and Amortization 4,679 5,886 [1] 3,464 [1]
Purchased Product, Transportation and Blending   31,364  
Oil Sands      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Purchased Product   2,404  
Transportation and Blending   8,625  
Purchased Product, Transportation and Blending   11,029  
Canadian Manufacturing      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Gross Sales   6,215  
Purchased Product   5,156  
Operating   486  
Depreciation, Depletion and Amortization   226  
Gross sales less purchased product   347  
Retail      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Gross Sales   0  
Purchased Product   0  
Operating   0  
Depreciation, Depletion and Amortization   0  
Gross sales less purchased product   0  
Corporate and Eliminations      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Gross Sales (7,464) (5,291) (609)
Purchased Product (5,533) (3,844) (278)
Operating (1,270) (783) (306)
Transportation and Blending (664) (676) (36)
Depreciation, Depletion and Amortization $ 113 118 $ 161
Gross sales less purchased product   (771)  
Previously Reported      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Purchased Product   23,481  
Transportation and Blending   7,883  
Purchased Product, Transportation and Blending   31,364  
Previously Reported | Oil Sands      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Purchased Product   3,188  
Transportation and Blending   7,841  
Purchased Product, Transportation and Blending   11,029  
Previously Reported | Canadian Manufacturing      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Gross Sales   4,472  
Purchased Product   3,552  
Operating   388  
Depreciation, Depletion and Amortization   167  
Gross sales less purchased product   365  
Previously Reported | Retail      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Gross Sales   2,158  
Purchased Product   2,019  
Operating   98  
Depreciation, Depletion and Amortization   59  
Gross sales less purchased product   (18)  
Previously Reported | Corporate and Eliminations      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Gross Sales   (5,706)  
Purchased Product   (4,888)  
Transportation and Blending   (47)  
Gross sales less purchased product   (771)  
Revisions      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Purchased Product   (155)  
Transportation and Blending   155  
Purchased Product, Transportation and Blending   0  
Revisions | Oil Sands      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Purchased Product   (784)  
Transportation and Blending   784  
Purchased Product, Transportation and Blending   0  
Revisions | Canadian Manufacturing      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Gross Sales   0  
Purchased Product   0  
Operating   0  
Depreciation, Depletion and Amortization   0  
Gross sales less purchased product   0  
Revisions | Retail      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Gross Sales   0  
Purchased Product   0  
Operating   0  
Depreciation, Depletion and Amortization   0  
Gross sales less purchased product   0  
Revisions | Corporate and Eliminations      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Gross Sales   0  
Purchased Product   629  
Transportation and Blending   (629)  
Gross sales less purchased product   0  
Segment Aggregation      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Purchased Product   0  
Transportation and Blending   0  
Purchased Product, Transportation and Blending   0  
Segment Aggregation | Oil Sands      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Purchased Product   0  
Transportation and Blending   0  
Purchased Product, Transportation and Blending   0  
Segment Aggregation | Canadian Manufacturing      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Gross Sales   1,743  
Purchased Product   1,604  
Operating   98  
Depreciation, Depletion and Amortization   59  
Gross sales less purchased product   (18)  
Segment Aggregation | Retail      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Gross Sales   (2,158)  
Purchased Product   (2,019)  
Operating   (98)  
Depreciation, Depletion and Amortization   (59)  
Gross sales less purchased product   18  
Segment Aggregation | Corporate and Eliminations      
Disclosure Of Summary Of Significant Accounting Policies [Line Items]      
Gross Sales   415  
Purchased Product   415  
Transportation and Blending   0  
Gross sales less purchased product   $ 0  
[1] See Note 3X for revisions to prior period results.