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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)

X

- 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

X

- 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

X

- Details

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

X

- Details

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