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Consolidated Statement Of Cash Flows (Parenthetical) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($)
Supplemental Cash Flow Elements [Abstract] |
Long-term debt assumed by 3rd party | $ 568

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Long-Term Debt Assumed by 3rd party + References No definition available. + Details
Name: | xom_LongTermDebtAssumedBy3rdParty
Namespace Prefix: | xom_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration