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Financial Instruments and Derivatives - Derivative Instrument Balance Sheet (Details) bbl in Millions, MMBTU in Millions	12 Months Ended
	Dec. 31, 2024 MMBTU bbl	Dec. 31, 2023 MMBTU bbl
Crude Oil [Member] | Long [Member]
Net notional long / short position of derivative instruments bbl	13
Crude Oil [Member] | Short [Member]
Net notional long / short position of derivative instruments bbl		7
Petroleum Products [Member] | Short [Member]
Net notional long / short position of derivative instruments bbl	32	43
Natural Gas [Member] | Short [Member]
Net notional long / short position of derivative instruments MMBtus | MMBTU	675	560

X

- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:energyItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:volumeItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

Name:	us-gaap_PositionAxis=us-gaap_LongMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PositionAxis=us-gaap_ShortMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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