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Financial and derivative instruments - Summary of net notional long/(short) position of derivative instruments (Detail) - bbl bbl in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Crude barrels [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Volume | (620) | 7,390
Products barrels [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Volume | (70) | (560)

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- Definition Derivative nonmonetary notional amount volumes. + References No definition available. + Details
Name: | imo_DerivativeNonmonetaryNotionalAmountVolumes
Namespace Prefix: | imo_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_EnergyAxis=imo_CrudeBarrelsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_EnergyAxis=imo_ProductsBarrelsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |