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Prior Period Revisions (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disclosure of changes in accounting estimates [line items]            
Gross Sales $ 15,712     $ 18,697 $ 41,438 $ 56,827
Purchased Product 6,620 [1] $ 5,728 $ 5,809 10,052 [1] 18,157 [1] 27,038 [1]
Transportation and Blending 2,164 [1] 2,563 2,752 2,579 [1] 7,479 [1] 8,406 [1]
Operating 1,553 [1] 1,600 1,636 1,504 [1] 4,789 [1] 4,360 [1]
Depreciation, Depletion and Amortization 1,197     1,047 3,374 3,209
Purchased Product, Transportation And Blending, Operating   9,891 10,197 14,135   39,804
Oil Sands            
Disclosure of changes in accounting estimates [line items]            
Gross Sales   6,437 5,707 8,764   28,030
Purchased Product   414 355 1,919   4,202
Gross sales and purchased product   6,023 5,352 6,845   23,828
Gross sales less purchased product   6,023 5,352 6,845   23,828
Conventional            
Disclosure of changes in accounting estimates [line items]            
Gross Sales   620 1,037 1,036   3,286
Purchased Product   337 483      
Transportation and Blending   66 81 64   191
Gross sales less purchased product and transportation and blending   217 473      
Gross Sales Less Transportation And Blending       972   3,095
U.S. Manufacturing            
Disclosure of changes in accounting estimates [line items]            
Gross Sales   6,064 5,629 8,705   23,688
Purchased Product   5,364 4,898 7,930   20,351
Gross sales and purchased product   700 731 775   3,337
Gross sales less purchased product   700 731 775   3,337
Corporate and Eliminations            
Disclosure of changes in accounting estimates [line items]            
Gross Sales (2,729) (1,844) (1,496) (2,426) (6,069) (5,772)
Purchased Product (2,227) (1,470) (1,020) (2,011) (4,717) (4,040)
Transportation and Blending (233) (207) (275) (247) (715) (911)
Operating (139) (126) (147) (191) (412) (765)
Depreciation, Depletion and Amortization $ 19     27 $ 59 86
Gross sales less purchased product, transportation and blending and operating   (41) (54) 23   (56)
Canadian Manufacturing            
Disclosure of changes in accounting estimates [line items]            
Gross Sales       2,168   6,020
Purchased Product       1,750   5,065
Transportation and Blending       0   0
Operating       172   534
Depreciation, Depletion and Amortization       42   164
Gross sales less purchased product, transportation, blending and operating, and depreciation, depletion and amortization       204   257
Retail            
Disclosure of changes in accounting estimates [line items]            
Gross Sales       0   0
Purchased Product       0   0
Operating       0   0
Depreciation, Depletion and Amortization       0   0
Gross Sales Less Purchased Product, Operating, And Depreciation, Depletion And Amortization       0   0
Previously Reported            
Disclosure of changes in accounting estimates [line items]            
Purchased Product   5,709 5,792 10,012   26,890
Transportation and Blending   2,641 2,853 2,684   8,707
Operating   1,541 1,552 1,439   4,207
Purchased Product, Transportation And Blending, Operating   9,891 10,197 14,135   39,804
Previously Reported | Oil Sands            
Disclosure of changes in accounting estimates [line items]            
Gross Sales   6,556 5,911 8,778   28,044
Purchased Product   533 559 1,933   4,216
Gross sales and purchased product   6,023 5,352 6,845   23,828
Gross sales less purchased product   6,023 5,352 6,845   23,828
Previously Reported | Conventional            
Disclosure of changes in accounting estimates [line items]            
Gross Sales   615 1,031 1,010   3,201
Purchased Product   352 510      
Transportation and Blending   46 48 38   106
Gross sales less purchased product and transportation and blending   217 473      
Gross Sales Less Transportation And Blending       972   3,095
Previously Reported | U.S. Manufacturing            
Disclosure of changes in accounting estimates [line items]            
Gross Sales   6,198 5,860 8,719   23,702
Purchased Product   5,498 5,129 7,944   20,365
Gross sales and purchased product   700 731 775   3,337
Gross sales less purchased product   700 731 775   3,337
Previously Reported | Corporate and Eliminations            
Disclosure of changes in accounting estimates [line items]            
Gross Sales   (2,092) (1,925) (2,619)   (6,162)
Purchased Product   (1,757) (1,499) (2,267)   (4,660)
Transportation and Blending   (109) (141) (119)   (528)
Operating   (185) (231) (256)   (918)
Gross sales less purchased product, transportation and blending and operating   (41) (54) 23   (56)
Previously Reported | Canadian Manufacturing            
Disclosure of changes in accounting estimates [line items]            
Gross Sales       1,478   4,043
Purchased Product       1,092   3,192
Transportation and Blending       3   3
Operating       134   438
Depreciation, Depletion and Amortization       37   143
Gross sales less purchased product, transportation, blending and operating, and depreciation, depletion and amortization       212   267
Previously Reported | Retail            
Disclosure of changes in accounting estimates [line items]            
Gross Sales       881   2,424
Purchased Product       846   2,317
Operating       38   96
Depreciation, Depletion and Amortization       5   21
Gross Sales Less Purchased Product, Operating, And Depreciation, Depletion And Amortization       (8)   (10)
Revisions            
Disclosure of changes in accounting estimates [line items]            
Purchased Product   19 17 40   148
Transportation and Blending   (78) (101) (105)   (301)
Operating   59 84 65   153
Purchased Product, Transportation And Blending, Operating   0 0 0   0
Revisions | Oil Sands            
Disclosure of changes in accounting estimates [line items]            
Gross Sales   (119) (204) (14)   (14)
Purchased Product   (119) (204) (14)   (14)
Gross sales and purchased product   0 0 0   0
Gross sales less purchased product   0 0 0   0
Revisions | Conventional            
Disclosure of changes in accounting estimates [line items]            
Gross Sales   5 6 26   85
Purchased Product   (15) (27)      
Transportation and Blending   20 33 26   85
Gross sales less purchased product and transportation and blending   0 0      
Gross Sales Less Transportation And Blending       0   0
Revisions | U.S. Manufacturing            
Disclosure of changes in accounting estimates [line items]            
Gross Sales   (134) (231) (14)   (14)
Purchased Product   (134) (231) (14)   (14)
Gross sales and purchased product   0 0 0   0
Gross sales less purchased product   0 0 0   0
Revisions | Corporate and Eliminations            
Disclosure of changes in accounting estimates [line items]            
Gross Sales   248 429 2   (57)
Purchased Product   287 479 65   173
Transportation and Blending   (98) (134) (128)   (383)
Operating   59 84 65   153
Gross sales less purchased product, transportation and blending and operating   $ 0 $ 0 0   0
Revisions | Canadian Manufacturing            
Disclosure of changes in accounting estimates [line items]            
Gross Sales       0   0
Purchased Product       3   3
Transportation and Blending       (3)   (3)
Operating       0   0
Depreciation, Depletion and Amortization       0   0
Gross sales less purchased product, transportation, blending and operating, and depreciation, depletion and amortization       0   0
Revisions | Retail            
Disclosure of changes in accounting estimates [line items]            
Gross Sales       0   0
Purchased Product       0   0
Operating       0   0
Depreciation, Depletion and Amortization       0   0
Gross Sales Less Purchased Product, Operating, And Depreciation, Depletion And Amortization       0   0
Segment Aggregation            
Disclosure of changes in accounting estimates [line items]            
Purchased Product       0   0
Transportation and Blending       0   0
Operating       0   0
Purchased Product, Transportation And Blending, Operating       0   0
Segment Aggregation | Oil Sands            
Disclosure of changes in accounting estimates [line items]            
Gross Sales       0   0
Purchased Product       0   0
Gross sales and purchased product       0   0
Gross sales less purchased product       0   0
Segment Aggregation | Conventional            
Disclosure of changes in accounting estimates [line items]            
Gross Sales       0   0
Transportation and Blending       0   0
Gross Sales Less Transportation And Blending       0   0
Segment Aggregation | U.S. Manufacturing            
Disclosure of changes in accounting estimates [line items]            
Gross Sales       0   0
Purchased Product       0   0
Gross sales and purchased product       0   0
Gross sales less purchased product       0   0
Segment Aggregation | Corporate and Eliminations            
Disclosure of changes in accounting estimates [line items]            
Gross Sales       191   447
Purchased Product       191   447
Transportation and Blending       0   0
Operating       0   0
Gross sales less purchased product, transportation and blending and operating       0   0
Segment Aggregation | Canadian Manufacturing            
Disclosure of changes in accounting estimates [line items]            
Gross Sales       690   1,977
Purchased Product       655   1,870
Transportation and Blending       0   0
Operating       38   96
Depreciation, Depletion and Amortization       5   21
Gross sales less purchased product, transportation, blending and operating, and depreciation, depletion and amortization       (8)   (10)
Segment Aggregation | Retail            
Disclosure of changes in accounting estimates [line items]            
Gross Sales       (881)   (2,424)
Purchased Product       (846)   (2,317)
Operating       (38)   (96)
Depreciation, Depletion and Amortization       (5)   (21)
Gross Sales Less Purchased Product, Operating, And Depreciation, Depletion And Amortization       $ 8   $ 10
[1] Comparative periods reflect certain revisions. See Note 26