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Summarized Financial Data – Chevron Phillips Chemical Company LLC (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Subsidiary Statements Captions [Line Items] |  |  |  |
Percentage of affiliate by summarized financial information |  | 100.00% |  |
Summarized Financial Data - Chevron Transport Corporation |  |  |  |
Sales and other operating revenues | [1] | $ 134,674 | $ 110,215 | $ 129,925
Total costs and other deductions |  | 132,501 | 116,632 | 133,635
Net income (loss) attributable to Chevron Corporation |  | $ 9,195 | (497) | 4,587
Chevron Phillips Chemical Company LLC |  |  |  |
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 |  | $ 9,063 | 8,455 | 9,248
Total costs and other deductions |  | 8,126 | 7,017 | 7,136
Net income (loss) attributable to Chevron Corporation |  | $ 1,446 | $ 1,687 | $ 2,651
[1] | Includes excise, value-added and similar taxes. $7,189; $6,905; $7,359.

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