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Description of Business and Segmented Disclosures - Schedule of Revenues by Product (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Reportable Segments [Line Items] |  |  |
Refined Products | $ 4,734 | $ 8,291 | $ 9,032
Market Optimization | 1,317 | 2,222 | 2,151
Corporate and Eliminations | (609) | (689) | (724)
Revenue | 13,227 | 20,180 | 20,843
Upstream [Member] |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Crude Oil | 7,270 | 9,790 | 9,662
NGLs | 142 | 202 | 333
Natural Gas | 315 | 299 | 320
Other | $ 58 | $ 65 | $ 69

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