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Pension And Other Postretirement Benefits (Summary Of The Change In Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total (charge)/credit to other comprehensive income, before tax | $ 784 | $ (504) | $ 4,799
(Charge)/credit to income tax (see Note 4) | (208) | 180 | (1,236)
(Charge)/credit to investment in equity companies | 24 | 16 | 235
(Charge)/credit to other comprehensive income including noncontrolling interests, after tax | 600 | (308) | 3,798
Charge/(credit) to equity of noncontrolling interests | (120) | 54 | (212)
Other Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total (charge)/credit to other comprehensive income, before tax | (86) | (4) | 1,881
Exxon Mobil Corporation Share After Noncontrolling Interest [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total change in accumulated other comprehensive income | 480 | (254) | 3,586
United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total (charge)/credit to other comprehensive income, before tax | 82 | 141 | 939
Pension Benefits - Non-U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total (charge)/credit to other comprehensive income, before tax | $ 788 | $ (641) | $ 1,979

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