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Summarized Financial Data - Chevron Phillips Chemical Company LLC (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	[1]	$ 35,968	$ 31,524
Costs and other deductions		32,691	30,292
Net income attributable to TCO		$ 3,638	2,682
Chevron Phillips Chemical Company LLC
Affiliate Statements Captions [Line Items]
Percentage of affiliate by summarized financial information		100.00%
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues		$ 2,577	2,445
Costs and other deductions		2,151	2,019
Net income attributable to TCO		$ 585	$ 503
Chevron Phillips Chemical Company LLC
Affiliate Statements Captions [Line Items]
Equity method investment, ownership percentage		50.00%
[1] 2017 includes excise, value-added and similar taxes of $1,677 million 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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