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Derivatives and Risk Management Activities - Financial Impact (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	$ 36	$ (47)
Commodity Derivatives | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	32	(27)
Commodity Derivatives | Transportation segment revenues
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	2	2
Commodity Derivatives | Field operating costs
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	(2)	(4)
Interest Rate Derivatives | Interest expense, net
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	(2)	(1)
Foreign Currency Derivatives | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	6	(17)
Derivatives in Hedging Relationships
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	(1)	6
Derivatives in Hedging Relationships | Commodity Derivatives | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	1	7
Derivatives in Hedging Relationships | Interest Rate Derivatives | Interest expense, net
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	(2)	(1)
Derivatives Not Designated as a Hedge
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	37	(53)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	31	(34)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Transportation segment revenues
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	2	2
Derivatives Not Designated as a Hedge | Commodity Derivatives | Field operating costs
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	(2)	(4)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total Gain/(Loss) on Derivatives Recognized in Net Income	$ 6	$ (17)

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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+ References

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