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Summarized Financial Data - Chevron Phillips Chemical Company LLC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	$ 42,552	$ 23,997	$ 109,745	$ 69,628
Costs and other deductions	36,655	24,495	99,682	75,942
Net income attributable to equity method investee	6,111	(207)	10,570	(4,878)
Oil and Gas
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	$ 42,552	$ 23,997	$ 109,745	69,628
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			$ 7,972	5,179
Net income attributable to equity method investee			2,797	877
Chevron Phillips Chemical Company LLC \| Oil and Gas
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues			$ 10,414	$ 6,093
Chevron Phillips Chemical Company LLC
Affiliate Statements Captions [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%