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Derivatives and Risk Management Activities - Financial Impact (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	$ 93	$ (137)	$ 182	$ (101)
Commodity Derivatives | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	99	(160)	195	(128)
Commodity Derivatives | Transportation segment revenues
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income		1		3
Commodity Derivatives | Field operating costs
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	(1)	2	(4)
Commodity Derivatives | Depreciation and amortization
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	(3)		(3)
Interest Rate Derivatives | Interest expense, net
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	(4)	(4)	(6)	(6)
Foreign Currency Derivatives | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income		(1)	2	5
Preferred Distribution Rate Reset Option | Other income/(expense), net
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	2	25	(2)	25
Derivatives in Hedging Relationships
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	(7)	(5)	(9)	(6)
Derivatives in Hedging Relationships | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Loss recognized due to anticipated hedged transactions now considered probable of not occurring		2		2
Derivatives in Hedging Relationships | Interest expense, net
Impact of derivative activities recognized in earnings
Loss recognized due to anticipated hedged transactions now considered probable of not occurring	2	2	2	2
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)
Derivatives in Hedging Relationships | Commodity Derivatives | Depreciation and amortization
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	(3)		(3)
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	(4)	(4)	(6)	(6)
Derivatives Not Designated as a Hedge
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	100	(132)	191	(95)
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	99	(159)	195	(128)
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		1		3
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	(1)	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		(1)	2	5
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other income/(expense), net
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	$ 2	$ 25	$ (2)	$ 25

X

- 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=84234895&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=84234895&loc=SL5624171-113959

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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