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Summarized Financial Data - Chevron Phillips Chemical Company LLC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Summarized Financial Data - Chevron Transport Corporation
Costs and other deductions	$ 24,091	$ 32,915	$ 51,447	$ 64,158
Net income attributable to equity method investee	$ (8,270)	$ 4,305	$ (4,671)	6,954
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			$ 3,500	4,012
Net income attributable to equity method investee			420	1,008
Chevron Phillips Chemical Company LLC \| Oil and Gas
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues			$ 3,998	$ 4,840
Chevron Phillips Chemical Company LLC
Affiliate Statements Captions [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%