Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014
Tengizchevroil LLP [Member]
Affiliate Statements Captions [Line Items]
Sales and other operating revenues	$ 10,215	$ 18,628
Costs and other deductions	5,779	8,112
Net income attributable to TCO	$ 3,109	$ 7,360
Tengizchevroil LLP [Member]
Affiliate Statements Captions [Line Items]
Equity ownership, percentage	50.00%
Percentage of affiliate by summarized financial information	100.00%

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