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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Level 3
Rollforward of Level 3 Net Asset/(Liability)
Beginning Balance	$ (36)	$ 11
Net losses for the period included in earnings	(3)	(1)
Settlements	3	(9)
Derivatives entered into during the period		(60)
Ending Balance	(36)	(59)
Change in unrealized gains/(losses) included in earnings relating to Level 3 derivatives still held at the end of the period	(2)	$ (1)
Recurring Fair Value Measures
Recurring Fair Value Measurements
Net derivative asset/(liability)	(87)		$ (373)
Recurring Fair Value Measures | Commodity Derivatives
Recurring Fair Value Measurements
Net derivative asset/(liability)	(6)		(288)
Recurring Fair Value Measures | Interest Rate Derivatives
Recurring Fair Value Measurements
Net derivative asset/(liability)	(43)		(50)
Recurring Fair Value Measures | Foreign Currency Derivatives
Recurring Fair Value Measurements
Net derivative asset/(liability)	(2)		(3)
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option
Recurring Fair Value Measurements
Net derivative asset/(liability)	(36)		(32)
Recurring Fair Value Measures | Level 1
Recurring Fair Value Measurements
Net derivative asset/(liability)	(6)		(113)
Recurring Fair Value Measures | Level 1 | Commodity Derivatives
Recurring Fair Value Measurements
Net derivative asset/(liability)	(6)		(113)
Recurring Fair Value Measures | Level 2
Recurring Fair Value Measurements
Net derivative asset/(liability)	(45)		(224)
Recurring Fair Value Measures | Level 2 | Commodity Derivatives
Recurring Fair Value Measurements
Net derivative asset/(liability)			(171)
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives
Recurring Fair Value Measurements
Net derivative asset/(liability)	(43)		(50)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives
Recurring Fair Value Measurements
Net derivative asset/(liability)	(2)		(3)
Recurring Fair Value Measures | Level 3
Recurring Fair Value Measurements
Net derivative asset/(liability)	(36)		(36)
Recurring Fair Value Measures | Level 3 | Commodity Derivatives
Recurring Fair Value Measurements
Net derivative asset/(liability)			(4)
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option
Recurring Fair Value Measurements
Net derivative asset/(liability)	$ (36)		$ (32)

X

- Definition

Amount of derivatives entered into classified as a derivative asset (liability) after deduction of derivative asset (liability), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

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Amount of unrealized gain (loss) recognized in the income statement for a financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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