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Summarized Financial Data - Chevron Phillips Chemical Company LLC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	$ 23,997	$ 34,779	$ 69,628	$ 105,291
Costs and other deductions	24,495	32,067	75,942	96,225
Net income attributable to equity method investee	(207)	2,580	(4,878)	9,534
Oil and Gas
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	$ 23,997	$ 34,779	$ 69,628	105,291
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			$ 5,179	5,992
Net income attributable to equity method investee			877	1,464
Chevron Phillips Chemical Company LLC \| Oil and Gas
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues			$ 6,093	$ 7,209
Chevron Phillips Chemical Company LLC
Affiliate Statements Captions [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%