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Divestment Activities (Narrative) (Details) - Disposal Group, Disposed of by Sale - USD ($) $ in Billions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Income statement, balance sheet and additional disclosures by disposal groups, including discontinued operations [Line Items]
Proceeds from divestment activities	$ 2.1	$ 5.0
Disposal group not discontinued operation gain loss on disposal, after tax	$ 0.4	$ 1.0

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3A

+ Details

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X

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

+ Details

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Balance Type:	debit
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X

- Definition

Disposal Group Not Discontinued Operation Gain Loss On Disposal, After Tax

+ References

No definition available.

+ Details

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Namespace Prefix:	xom_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

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