Summarized Financial Data - Chevron U.S.A. Inc. (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Income - Chevron U.S.A. Inc.
Sales and other operating revenues	[1]	$ 27,844	$ 36,829	$ 50,914	$ 69,144
Costs and other deductions		31,352	38,994	56,616	70,647
Net income (loss) attributable to CUSA		$ (1,470)	$ 571	(2,195)	3,138
Chevron U.S.A. Inc. [Member]
Statement of Income - Chevron U.S.A. Inc.
Sales and other operating revenues				38,275	52,777
Costs and other deductions				40,905	54,019
Net income (loss) attributable to CUSA				$ (1,218)	$ (290)

[1] Includes excise, value-added and similar taxes: 1,784; 1,965; 3,436; 3,842