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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
		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

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