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Schedule of Unconditional Purchase Obligations (Parenthetical) (Detail) (CAD) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |
Undiscounted obligations mainly pertaining to pipeline throughput agreements | 681 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount | [1] |  |
Total payments under unconditional purchase obligations | 112 us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases |  | 95 us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases | 86 us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases
Imputed interest on commitments | 125 us-gaap_UnrecordedUnconditionalPurchaseObligationImputedInterest |  |  |
Total present value of commitments excluding imputed interest | 556 imo_PresentValueUnconditionalPurchaseObligationExcludingImputedInterest |  |  |
[1] | Undiscounted obligations of $681 million mainly pertain to pipeline throughput agreements. Total payments under unconditional purchase obligations were $112 million (2013 - $95 million, 2012 - $86 million). The present value of these commitments, excluding imputed interest of $125 million, totalled $556 million.

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- Definition Present value of unconditional purchase obligation, excluding imputed interest. + References No definition available. + Details
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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition If disclosed, the amount of imputed interest necessary to reduce an unconditional purchase obligation to present value on an unrecorded unconditional purchase obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25376-109308 + Details
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- Details
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- Definition The amount purchased during the period under an unrecorded unconditional purchase obligation (for example, under the take-or-pay or throughput contract). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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