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Financial Instruments And Derivatives (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Financial Instruments And Derivatives [Abstract] |  |
Initial margin collateral receivable | $ 491 | $ 800

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- Definition Accounts Receivable Exchange Collateral + References No definition available. + Details
Name: | xom_AccountsReceivableExchangeCollateral
Namespace Prefix: | xom_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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