Summarized Financial Data - Chevron Phillips Chemical Company LLC (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	$ 52,314	$ 31,076
Costs and other deductions	45,319	29,852
Net income attributable to equity method investee	6,259	1,377
Oil and Gas
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	$ 52,314	31,076
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	$ 3,106	2,553
Net income attributable to equity method investee	764	304
Chevron Phillips Chemical Company LLC \| Oil and Gas
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	$ 3,795	$ 2,748
Chevron Phillips Chemical Company LLC
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Equity method investment, ownership percentage	50.00%

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