Summarized Financial Data - Tengizchevroil LLP (Details) - Tengizchevroil LLP [Member] - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Affiliate Statements Captions [Line Items]
Equity ownership, percentage	50.00%
Percentage of affiliate by summarized financial information	100.00%
Sales and other operating revenues	$ 3,395	$ 2,260
Costs and other deductions	1,754	1,393
Net income attributable to TCO	$ 1,158	$ 604

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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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