Summarized Financial Data - Chevron U.S.A. Inc. (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsidiary Statements Captions [Line Items]
Sales and other operating revenues	[1]	$ 110,215	$ 129,925	$ 200,494
Total costs and other deductions		116,632	133,635	180,768
Net income (loss) attributable to CUSA		(497)	4,587	19,241
Chevron U.S.A. Inc. [Member]
Subsidiary Statements Captions [Line Items]
Sales and other operating revenues		83,715	97,766	157,198
Total costs and other deductions		87,429	101,565	153,139
Net income (loss) attributable to CUSA		$ (1,177)	$ (1,054)	$ 3,849

[1] Includes excise, value-added and similar taxes. $6,905; $7,359; $8,186.