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Investments, Loans and Long-Term Receivables (Summary of Financial Information for Equity Method Investments) (Details) - WRB Refining LP And Chevron Phillips Chemical Company LLC [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Summary of financial information |  |  |  |
Revenues | $ 4,778 | $ 5,920 | $ 8,468 | $ 10,826
Income before income taxes | 598 | 1,038 | 944 | 1,730
Net income | $ 575 | $ 1,024 | $ 904 | $ 1,696

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