Summarized Financial Data - Chevron U.S.A. Inc. (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Income - Chevron U.S.A. Inc.
Sales and other operating revenues	[1]	$ 32,877	$ 27,844	$ 64,401	$ 50,914
Costs and other deductions		32,527	31,352	62,819	56,616
Net income (loss) attributable to CUSA		$ 1,450	$ (1,470)	4,132	(2,195)
Chevron U.S.A. Inc.
Statement of Income - Chevron U.S.A. Inc.
Sales and other operating revenues				49,814	38,275
Costs and other deductions				49,592	40,905
Net income (loss) attributable to CUSA				$ 775	$ (1,218)

[1] Includes excise, value-added and similar taxes: $1,771, $1,784, $3,448, $3,436