Summarized Financial Data - Chevron Phillips Chemical Company LLC (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	[1]	$ 31,524	$ 23,070
Costs and other deductions		30,292	25,264
Net income attributable to TCO		$ 2,682	(725)
Chevron Phillips Chemical Company LLC [Member]
Subsidiary Statements Captions [Line Items]
Equity method investment, ownership percentage		50.00%
Percentage of affiliate by summarized financial information		100.00%
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues		$ 2,445	1,923
Costs and other deductions		2,019	1,555
Net income attributable to TCO		$ 503	$ 459

[1] Includes excise, value-added and similar taxes: $1,677, $1,652