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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

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