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Assets Held for Sale - Additional Information (Detail) - CAD CAD in Millions		1 Months Ended
	Mar. 08, 2016	Jul. 31, 2016	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Planned consideration on sale of remaining company-owned Esso retail stations	CAD 2,800
Net book value of sale of sites			CAD 741
Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of sites		CAD 85
Net book value of sale of sites		CAD 23
Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expected gain on Planned consideration on sale of remaining company-owned Esso retail stations	2,000
Expected gain on Planned consideration on sale of remaining company-owned Esso retail stations, net of tax	1,700
Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expected gain on Planned consideration on sale of remaining company-owned Esso retail stations	2,100
Expected gain on Planned consideration on sale of remaining company-owned Esso retail stations, net of tax	CAD 1,800

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Planned disposal group consideration.

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Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (e)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1107-107759

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2510-110228

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The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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