XML 129 R70.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Gains and Losses on Asset Sales (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investment And Other Income [Line Items] |  |  |  |
Proceeds from asset sales |  | $ 82 | $ 59 | $ 232
Book value of asset sales |  | 36 | 5 | 12
Gain (loss) on asset sales, before-tax | [1] | 46 | 54 | 220
Gain (loss) on asset sales, after-tax | [1] | $ 42 | $ 38 | $ 192
[1] | 2017 included a gain of $174 million ($151 million after tax) from the sale of surplus property in Ontario.

X
- Definition Book Value of Assets Sold + References No definition available. + Details
Name: | imo_BookValueOfAssetsSold
Namespace Prefix: | imo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Investment And Other Income [Line Items] + References No definition available. + Details
Name: | imo_InvestmentAndOtherIncomeLineItems
Namespace Prefix: | imo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net gain (loss) on asset sales, after tax. + References No definition available. + Details
Name: | imo_NetGainLossOnAssetSalesAfterTax
Namespace Prefix: | imo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnDispositionOfAssets1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration