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Description of Business and Segmented Disclosures - Schedule of Assets by Segment (Detail) - CAD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets $ 725 $ 720
Property, plant and equipment 32,851 34,225
Right-of-use assets 1,916 2,010
Goodwill 3,473 3,473
Assets 55,894 54,104
Current assets 15,321 11,988
Oil Sands    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 659 653
Property, plant and equipment 21,734 22,535
Right-of-use assets 738 754
Goodwill 3,473 3,473
Assets 30,917 31,070
Oil Sands | Canada | Assets and liabilities classified as held for sale    
Disclosure Of Reportable Segments [Line Items]    
Current assets   593
Conventional    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 5 6
Property, plant and equipment 1,797 2,174
Right-of-use assets 2 2
Goodwill 0 0
Assets 3,110 3,026
Conventional | Canada | Assets and liabilities classified as held for sale    
Disclosure Of Reportable Segments [Line Items]    
Current assets   159
Offshore    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 61 61
Property, plant and equipment 2,390 2,822
Right-of-use assets 160 160
Goodwill 0 0
Assets 3,115 3,597
Canadian Manufacturing    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 0 0
Property, plant and equipment 2,274 2,353
Right-of-use assets 291 339
Goodwill 0 0
Assets 2,786 2,918
U.S. Manufacturing    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 0 0
Property, plant and equipment 4,103 3,745
Right-of-use assets 246 252
Goodwill 0 0
Assets 9,489 7,777
Retail    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 0 0
Property, plant and equipment 184 205
Right-of-use assets 39 49
Goodwill 0 0
Assets 992 966
Retail | Canada | Assets and liabilities classified as held for sale    
Disclosure Of Reportable Segments [Line Items]    
Current assets 525 552
Corporate and Eliminations    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 0 0
Property, plant and equipment 369 391
Right-of-use assets 440 454
Goodwill 0 0
Assets $ 5,485 $ 4,750