Assets Held for Sale - Additional Information (Detail) CAD in Billions	Mar. 08, 2016 CAD
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Planned consideration on sale and transition of remaining company-owned Esso retail stations	CAD 2.8
Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expected gain on Planned consideration on sale and transition of remaining company-owned Esso retail stations	2.0
Expected gain on Planned consideration on sale and transition of remaining company-owned Esso retail stations, net of tax	1.6
Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expected gain on Planned consideration on sale and transition of remaining company-owned Esso retail stations	2.1
Expected gain on Planned consideration on sale and transition of remaining company-owned Esso retail stations, net of tax	CAD 1.7