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

X

- Definition

Present value of unconditional purchase obligation, excluding imputed interest.

+ References

No definition available.

+ Details

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Namespace Prefix:	imo_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- 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

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X

- 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

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X

- 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

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