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Mergers and Acquisitions (Unaudited Pro Forma) - Pioneer (Details) - Pioneer Natural Resources - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Business Acquisition [Line Items] |  |
Sales and other operating revenues | $ 347,406 | $ 358,014
Net income (loss) attributable to ExxonMobil | $ 34,476 | $ 39,211

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