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Summarized Financial Data – Chevron Phillips Chemical Company LLC (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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Percentage of affiliate by summarized financial information		100.00%
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	[1]	$ 134,674	$ 110,215	$ 129,925
Total costs and other deductions		132,501	116,632	133,635
Net income (loss) attributable to Chevron Corporation		$ 9,195	(497)	4,587
Chevron Phillips Chemical Company LLC
Subsidiary Statements Captions [Line Items]
Equity method investment, ownership percentage		50.00%
Percentage of affiliate by summarized financial information		100.00%
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues		$ 9,063	8,455	9,248
Total costs and other deductions		8,126	7,017	7,136
Net income (loss) attributable to Chevron Corporation		$ 1,446	$ 1,687	$ 2,651
[1] Includes excise, value-added and similar taxes. $7,189; $6,905; $7,359.

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