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Derivatives and Risk Management Activities - Financial Impact (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	$ (59)	$ (235)	$ (450)	$ (53)
Commodity Derivatives | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	(59)	(226)	(443)	(31)
Commodity Derivatives | Field operating costs
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	(1)	(4)		(8)
Commodity Derivatives | Depreciation and amortization
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income				(3)
Interest Rate Derivatives | Interest expense, net
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	(2)	(10)	(3)	(16)
Foreign Currency Derivatives | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	5	3	(7)	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)	2	3
Derivatives in Hedging Relationships
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	(2)	(10)	(3)	(19)
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)
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)	(10)	(3)	(16)
Derivatives Not Designated as a Hedge
Impact of derivative activities recognized in earnings
Total gain/(loss) on derivatives recognized in net income	(57)	(225)	(447)	(34)
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	(59)	(226)	(443)	(31)
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)	(4)		(8)
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	5	3	(7)	$ 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)	$ 2	$ 3

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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+ References

No definition available.

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