Summarized Financial Data – Chevron Phillips Chemical Company LLC (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsidiary Statements Captions [Line Items]
Percentage of affiliate by summarized financial information			100.00%
Summarized Financial Data - Chevron Transport Corporation
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 Chevron Corporation		$ (497)	4,587	19,241
Chevron Phillips Chemical Company LLC [Member]
Subsidiary Statements Captions [Line Items]
Percentage of affiliate by summarized financial information		100.00%
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues		$ 8,455	9,248	13,416
Total costs and other deductions		7,017	7,136	10,776
Net income (loss) attributable to Chevron Corporation		$ 1,687	$ 2,651	$ 3,288
Chevron Phillips Chemical Company LLC [Member]
Subsidiary Statements Captions [Line Items]
Equity method investment, ownership percentage		50.00%

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