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Summarized Financial Data – Chevron Phillips Chemical Company LLC - Summary of Income Statement Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsidiary Statements Captions [Line Items]
Percentage of affiliate by summarized financial information	100.00%
Summarized Financial Data - Chevron Transport Corporation
Total costs and other deductions	$ 102,145	$ 140,980	$ 145,764
Net Income (Loss) Attributable to Chevron Corporation	$ (5,543)	2,924	14,824
Chevron Phillips Chemical Company LLC
Subsidiary Statements Captions [Line Items]
Percentage of affiliate by summarized financial information	100.00%
Summarized Financial Data - Chevron Transport Corporation
Total costs and other deductions	$ 7,221	7,863	9,812
Net Income (Loss) Attributable to Chevron Corporation	1,260	1,760	2,069
Chevron Phillips Chemical Company LLC | Oil and Gas
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	$ 8,407	$ 9,333	$ 11,310
Chevron Phillips Chemical Company LLC
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Equity method investment, ownership percentage	50.00%

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