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Consolidated Balance Sheet (U.S. GAAP) (Parenthetical) (CAD) In Millions, except Share data in Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Due to related parties, current	75us-gaap_DueToRelatedPartiesCurrent	75us-gaap_DueToRelatedPartiesCurrent
Amounts (payable) receivable from related parties	(174)us-gaap_RelatedPartyTransactionDueFromToRelatedPartyCurrent	(170)us-gaap_RelatedPartyTransactionDueFromToRelatedPartyCurrent
Common shares outstanding	847,599us-gaap_CommonStockSharesOutstanding	847,599us-gaap_CommonStockSharesOutstanding
Long-term debt
Due to related parties	4,746us-gaap_DueToRelatedPartiesNoncurrent / us-gaap_BalanceSheetLocationAxis = imo_NoncurrentLiabilitiesMember	4,316us-gaap_DueToRelatedPartiesNoncurrent / us-gaap_BalanceSheetLocationAxis = imo_NoncurrentLiabilitiesMember
Other long-term debt
Due to related parties	96us-gaap_DueToRelatedPartiesNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember

X

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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- Definition

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date within one year where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

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