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Derivatives and Financial Instruments (Summary of Gains/(Losses) From Commodity Derivatives) (Details) - Commodity Derivatives [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Sales and Other Operating Revenues [Member] |  |  |  |  |
Summary of gains (losses) from commodity derivatives |  |  |  |  |
Gains (losses) from commodity derivatives | [1] | $ (182) | $ (143) | $ (268) | $ (174)
Other Income [Member] |  |  |  |  |
Summary of gains (losses) from commodity derivatives |  |  |  |  |
Gains (losses) from commodity derivatives | [1] | 7 | 4 | 16 | 47
Purchased Crude Oil and Products [Member] |  |  |  |  |
Summary of gains (losses) from commodity derivatives |  |  |  |  |
Gains (losses) from commodity derivatives | [1] | $ (89) | $ (71) | $ (125) | $ (51)
[1] | Hedge accounting has not been used for any item in the table.

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- Definition Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of price risk derivatives not designated 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=56946850&loc=SL5624171-113959 + Details
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