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Summarized Financial Data - Chevron U.S.A. Inc. - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Subsidiary Statements Captions [Line Items]
Sales and other operating revenues	$ 48,169	$ 48,926	$ 138,645	$ 145,080
Costs and other deductions	44,312	44,180	127,014	129,119
Net income (loss) attributable to CUSA	$ 3,539	$ 4,487	9,529	14,422
Chevron U.S.A. Inc.
Subsidiary Statements Captions [Line Items]
Sales and other operating revenues			107,295	112,708
Costs and other deductions			102,605	107,834
Net income (loss) attributable to CUSA			$ 4,148	$ 4,491

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