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Summarized Financial Data - Chevron Phillips Chemical Company LLC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	$ 36,117	$ 15,926	$ 67,193	$ 45,631
Costs and other deductions	33,175	24,091	63,027	51,447
Net income attributable to equity method investee	3,082	(8,270)	4,459	(4,671)
Oil and Gas
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	$ 36,117	$ 15,926	$ 67,193	45,631
Chevron Phillips Chemical Company LLC
Affiliate Statements Captions [Line Items]
Percentage of affiliate by summarized financial information	100.00%		100.00%
Summarized Financial Data - Chevron Transport Corporation
Costs and other deductions			$ 5,178	3,500
Net income attributable to equity method investee			1,544	420
Chevron Phillips Chemical Company LLC \| Oil and Gas
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues			$ 6,452	$ 3,998
Chevron Phillips Chemical Company LLC
Affiliate Statements Captions [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%