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Update to Significant Accounting Policies, Critical Accounting Judgements and Key Sources of Estimation Uncertainty - Schedule of Revision (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disclosure of changes in accounting estimates [line items]          
Gross Sales $ 20,747   $ 11,170 [1] $ 38,130 $ 20,836 [1]
Purchased Product 9,396 $ 7,482 5,255 [1] 16,878 9,458 [1]
Transportation and Blending 3,048 2,975 1,854 [1] 6,023 3,673 [1]
Gross Sales Less Purchased Product And Transportation And Blending   10,457 4,061   7,705
Oil Sands          
Disclosure of changes in accounting estimates [line items]          
Gross Sales     5,075   9,993
Purchased Product   1,212 430   1,119
Transportation and Blending   3,156 1,984   3,934
Gross Sales Less Purchased Product And Transportation And Blending   4,368 2,661   4,940
Corporate and Eliminations          
Disclosure of changes in accounting estimates [line items]          
Gross Sales (1,782)   (1,276) (3,543) (2,425)
Purchased Product (1,111) (1,282) (964) (2,393) (1,799)
Transportation and Blending $ (188) (221) (152) $ (409) (305)
Gross Sales Less Purchased Product And Transportation And Blending   (1,503) (1,116)   (2,104)
Previously Reported          
Disclosure of changes in accounting estimates [line items]          
Gross Sales     11,110   20,633
Purchased Product   7,538 5,253   9,347
Transportation and Blending   2,919 1,796   3,581
Gross Sales Less Purchased Product And Transportation And Blending   10,457 4,061   7,705
Previously Reported | Oil Sands          
Disclosure of changes in accounting estimates [line items]          
Gross Sales     5,015   9,790
Purchased Product   1,483 574   1,292
Transportation and Blending   2,885 1,780   3,558
Gross Sales Less Purchased Product And Transportation And Blending   4,368 2,661   4,940
Previously Reported | Corporate and Eliminations          
Disclosure of changes in accounting estimates [line items]          
Purchased Product   (1,497) (1,110)   (2,083)
Transportation and Blending   (6) (6)   (21)
Gross Sales Less Purchased Product And Transportation And Blending   (1,503) (1,116)   (2,104)
Revisions          
Disclosure of changes in accounting estimates [line items]          
Gross Sales     60   203
Purchased Product   (56) 2   111
Transportation and Blending   56 58   92
Gross Sales Less Purchased Product And Transportation And Blending   0 0   0
Revisions | Oil Sands          
Disclosure of changes in accounting estimates [line items]          
Gross Sales     60   203
Purchased Product   (271) (144)   (173)
Transportation and Blending   271 204   376
Gross Sales Less Purchased Product And Transportation And Blending   0 0   0
Revisions | Corporate and Eliminations          
Disclosure of changes in accounting estimates [line items]          
Purchased Product   215 146   284
Transportation and Blending   (215) (146)   (284)
Gross Sales Less Purchased Product And Transportation And Blending   $ 0 $ 0   $ 0
[1] See Note 3 for revisions to prior period results.