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Other Comprehensive Income Information (Schedule of Accumulated Other Comprehensive Income Information) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Cumulative Translation Adjustment Summary [Roll Forward] |  |  |
Current period change excluding amounts reclassified from accumulated other comprehensive income | $ (3,550) | $ 1,241 | $ (3,482)
Amounts reclassified from accumulated other comprehensive income | 0 | 609 | 0
Postretirement Benefits Reserves Adjustment [Roll Forward] |  |  |
Current period change excluding amounts reclassified from accumulated other comprehensive income | 557 | (369) | 3,395
Amounts reclassified from accumulated other comprehensive income | 43 | 61 | 403
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance at beginning of period | (11,989) |  |
Balance at end of period | (14,619) | (11,989) |
Exxon Mobil Corporation Share After Noncontrolling Interest [Member] |  |  |
Cumulative Translation Adjustment Summary [Roll Forward] |  |  |
Balance at beginning of period | (13,056) | (14,591) | (11,499)
Current period change excluding amounts reclassified from accumulated other comprehensive income | (3,110) | 1,108 | (3,092)
Amounts reclassified from accumulated other comprehensive income | 0 | 427 | 0
Total change in accumulated other comprehensive income | (3,110) | 1,535 | (3,092)
Balance at end of period | (16,166) | (13,056) | (14,591)
Net investment hedge gain/(loss), net of taxes | 196 | (135) |
Postretirement Benefits Reserves Adjustment [Roll Forward] |  |  |
Balance at beginning of period | 1,067 | 1,321 | (2,265)
Current period change excluding amounts reclassified from accumulated other comprehensive income | 449 | (305) | 3,205
Amounts reclassified from accumulated other comprehensive income | 31 | 51 | 381
Total change in accumulated other comprehensive income | 480 | (254) | 3,586
Balance at end of period | 1,547 | 1,067 | 1,321
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance at beginning of period | (11,989) | (13,270) | (13,764)
Current period change excluding amounts reclassified from accumulated other comprehensive income | (2,661) | 803 | 113
Amounts reclassified from accumulated other comprehensive income | 31 | 478 | 381
Total change in accumulated other comprehensive income | (2,630) | 1,281 | 494
Balance at end of period | $ (14,619) | $ (11,989) | $ (13,270)

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