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Financial and Derivative Instruments Financial and Derivative Instruments (Details 1) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative instruments not designated as hedging instruments, gain (loss), net | $ (116) | $ (300) | $ 304
Commodity | Sales and other operating revenues |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative instruments not designated as hedging instruments, gain (loss), net | (105) | (269) | 277
Commodity | Purchased crude oil and products |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative instruments not designated as hedging instruments, gain (loss), net | (9) | (31) | 30
Commodity | Other income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative instruments not designated as hedging instruments, gain (loss), net | $ (2) | $ 0 | $ (3)

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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