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Summarized Financial Data - Chevron Phillips Chemical Company LLC (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Summarized Financial Data - Chevron Transport Corporation |  |  |
Sales and other operating revenues | [1] | $ 35,968 | $ 31,524
Costs and other deductions |  | 32,691 | 30,292
Net income attributable to TCO |  | $ 3,638 | 2,682
Chevron Phillips Chemical Company LLC |  |  |
Affiliate Statements Captions [Line Items] |  |  |
Percentage of affiliate by summarized financial information |  | 100.00% |
Summarized Financial Data - Chevron Transport Corporation |  |  |
Sales and other operating revenues |  | $ 2,577 | 2,445
Costs and other deductions |  | 2,151 | 2,019
Net income attributable to TCO |  | $ 585 | $ 503
Chevron Phillips Chemical Company LLC |  |  |
Affiliate Statements Captions [Line Items] |  |  |
Equity method investment, ownership percentage |  | 50.00% |
[1] | 2017 includes excise, value-added and similar taxes of $1,677 million collected on behalf of third parties. Beginning in 2018, these taxes are netted in "Taxes other than on income" in accordance with ASU 2014-09. Refer to Note 17, "Revenue" beginning on page 24.

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