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Financial Instruments and Derivatives - Derivative Instrument Balance Sheet (Details) bbl in Millions, MMBTU in Millions | 12 Months Ended
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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

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- Definition Nominal energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:energyItemType
Balance Type: | na
Period Type: | duration

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- 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

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

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

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

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

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