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Financial and Derivative Instruments (Details 1) - Commodity - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ (21) | $ 164
Sales and other operating revenues |  |
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | (12) | 162
Purchased crude oil and products |  |
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | (9) | 4
Other income |  |
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ 0 | $ (2)

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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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