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Other Long-Term Obligations (Detail) (CAD) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Other Liabilities [Line Items] |  |  |  |
Employee retirement benefits | 1,739 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent | [1] | 1,448 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent | [1]
Asset retirement obligations and other environmental liabilities | 1,325 imo_AssetRetirementObligationAndOtherEnvironmentalLiabilitiesNoncurrent | [2] | 1,258 imo_AssetRetirementObligationAndOtherEnvironmentalLiabilitiesNoncurrent | [2]
Share-based incentive compensation liabilities | 154 us-gaap_DeferredCompensationSharebasedArrangementsLiabilityClassifiedNoncurrent |  | 140 us-gaap_DeferredCompensationSharebasedArrangementsLiabilityClassifiedNoncurrent |
Other obligations | 347 us-gaap_OtherSundryLiabilitiesNoncurrent |  | 245 us-gaap_OtherSundryLiabilitiesNoncurrent |
Total other long-term obligations | 3,565 us-gaap_OtherLiabilitiesNoncurrent | [3] | 3,091 us-gaap_OtherLiabilitiesNoncurrent | [3]
[1] | Total recorded employee retirement benefit obligations also include $58 million in current liabilities (2013 - $53 million).
[2] | Total asset retirement obligations and other environmental liabilities also include $143 million in current liabilities (2013 - $154 million).
[3] | Other long-term obligations include amounts to related parties of $96 million (2013 - nil), (note 16).

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- Definition Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 + Details
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- Definition Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 + Details
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- Definition This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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