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Summarized Financial Data - Chevron U.S.A. Inc. - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Sales and other operating revenues	$ 34,189	$ 35,968
Costs and other deductions	31,243	32,691
Net income attributable to CUSA	2,649	3,638
Chevron U.S.A. Inc.
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Sales and other operating revenues	25,942	28,058
Costs and other deductions	25,757	27,596
Net income attributable to CUSA	$ 181	$ 697

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