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Mergers and Acquisitions (Actual and Pro Forma) (Details) - Pioneer Natural Resources Merger - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024
Business acquisition [Line Items]
Sales and other operating revenues	$ 6,291	$ 10,663
Net income (loss) attributable to ExxonMobil	$ 615	$ 1,013

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