Summarized Financial Data - Tengizchevroil LLP (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Tengizchevroil LLP [Member]
Affiliate Statements Captions [Line Items]
Sales and other operating revenues	$ 3,484	$ 6,433
Costs and other deductions	2,026	2,833
Net income attributable to TCO	$ 1,023	$ 2,514
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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Percentage of affiliate by summarized financial information.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The amount of the cost of sales reported by an equity method investment of the entity.

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The amount of net income (loss) reported by an equity method investment of the entity.

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The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

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