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Summarized Financial Data - Chevron U.S.A. Inc. (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Statement of Income - Chevron U.S.A. Inc.
Sales and other operating revenues	[1]	$ 35,968	$ 31,524
Costs and other deductions		32,691	30,292
Net income attributable to CUSA		3,638	2,682
Includes excise, value-added and similar taxes			1,677
Chevron U.S.A. Inc.
Statement of Income - Chevron U.S.A. Inc.
Sales and other operating revenues		28,058	24,408
Costs and other deductions		27,596	24,099
Net income attributable to CUSA		$ 697	421
Includes excise, value-added and similar taxes			$ 1,207
[1] 2017 includes excise, value-added and similar taxes of $1,677 million collected on behalf of third parties. Beginning in 2018, these taxes are netted in "Taxes other than on income" in accordance with ASU 2014-09. Refer to Note 17, "Revenue" beginning on page 24.

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