Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014
Tengizchevroil LLP [Member]
Affiliate Statements Captions [Line Items]
Sales and other operating revenues	$ 7,304	$ 12,537
Costs and other deductions	4,122	5,467
Net income attributable to TCO	$ 2,232	$ 4,948
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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