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Summarized Financial Data - Chevron Phillips Chemical Company LLC (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Summarized Financial Data - Chevron Transport Corporation
Total Revenues and Other Income	[1]		$ 32,877		$ 64,401
Costs and other deductions		$ 37,331	32,527	$ 70,022	62,819
Net income attributable to TCO		3,409	1,450	7,047	4,132
Oil and Gas
Summarized Financial Data - Chevron Transport Corporation
Total Revenues and Other Income		$ 40,491	$ 32,877	$ 76,459	64,401
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				$ 4,653	3,787
Net income attributable to TCO				1,235	1,093
Chevron Phillips Chemical Company LLC | Oil and Gas
Summarized Financial Data - Chevron Transport Corporation
Total Revenues and Other Income				$ 5,578	$ 4,701
Chevron Phillips Chemical Company LLC
Affiliate Statements Captions [Line Items]
Equity method investment, ownership percentage		50.00%		50.00%
[1] The three-month and six-month comparative periods ended June 30, 2017, include excise, value-added and similar taxes of $1,771 million and $3,448 million, respectively, collected on behalf of third parties. Beginning in 2018, these taxes are netted in "Taxes other than on income" in accordance with ASU 2014-09. Refer to Note 17, "Revenue" beginning on page 24.

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