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Number of Projects with Exploratory Well Costs (Detail) - Project | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Exploratory Wells Drilled [Line Items] |  |  |
Number of projects that only have exploratory well costs capitalized for a period of one year or less |  |  |
Number of projects that have exploratory well costs capitalized for a period of greater than one year |  |  |
Total projects |  |  |

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- Definition Number of projects with capitalized wells drilled in preceding twelve months. + References No definition available. + Details
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- Definition Projects that have Exploratory Well Costs that have been Capitalized + References No definition available. + Details
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Namespace Prefix: | imo_
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- References No definition available. + Details
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Namespace Prefix: | srt_
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- Definition The number of projects for which exploratory well costs have been capitalized for a period of greater than one year after the completion of drilling. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph b -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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