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Summarized Financial Data - Chevron Phillips Chemical Company LLC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	$ 31,076	$ 29,705
Costs and other deductions	29,852	27,356
Net income attributable to equity method investee	1,377	3,599
Oil and Gas
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	$ 31,076	29,705
Chevron Phillips Chemical Company LLC
Affiliate Statements Captions [Line Items]
Percentage of affiliate by summarized financial information	100.00%
Summarized Financial Data - Chevron Transport Corporation
Costs and other deductions	$ 2,553	1,812
Net income attributable to equity method investee	304	337
Chevron Phillips Chemical Company LLC | Oil and Gas
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	$ 2,748	$ 2,195
Chevron Phillips Chemical Company LLC
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Equity method investment, ownership percentage	50.00%

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