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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Level 3
Rollforward of Level 3 Net Asset/(Liability)
Beginning Balance	$ (29)	$ (51)
Net losses for the period included in earnings	(67)	(10)
Settlements	4
Ending Balance	(92)	(61)
Change in unrealized losses included in earnings relating to Level 3 derivatives still held at the end of the period	(67)	$ (10)
Recurring Fair Value Measures
Recurring Fair Value Measurements
Total net derivative asset/(liability)	(336)		$ (267)
Recurring Fair Value Measures | Commodity Derivatives
Recurring Fair Value Measurements
Total net derivative asset/(liability)	(370)		(301)
Recurring Fair Value Measures | Interest Rate Derivatives
Recurring Fair Value Measurements
Total net derivative asset/(liability)	114		46
Recurring Fair Value Measures | Foreign Currency Derivatives
Recurring Fair Value Measurements
Total net derivative asset/(liability)	1		2
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option
Recurring Fair Value Measurements
Total net derivative asset/(liability)	(81)		(14)
Recurring Fair Value Measures | Level 1
Recurring Fair Value Measurements
Total net derivative asset/(liability)	(241)		(143)
Recurring Fair Value Measures | Level 1 | Commodity Derivatives
Recurring Fair Value Measurements
Total net derivative asset/(liability)	(241)		(143)
Recurring Fair Value Measures | Level 1 | Interest Rate Derivatives
Recurring Fair Value Measurements
Total net derivative asset/(liability)	0		0
Recurring Fair Value Measures | Level 1 | Foreign Currency Derivatives
Recurring Fair Value Measurements
Total net derivative asset/(liability)	0		0
Recurring Fair Value Measures | Level 1 | Preferred Distribution Rate Reset Option
Recurring Fair Value Measurements
Total net derivative asset/(liability)	0		0
Recurring Fair Value Measures | Level 2
Recurring Fair Value Measurements
Total net derivative asset/(liability)	(3)		(95)
Recurring Fair Value Measures | Level 2 | Commodity Derivatives
Recurring Fair Value Measurements
Total net derivative asset/(liability)	(118)		(143)
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives
Recurring Fair Value Measurements
Total net derivative asset/(liability)	114		46
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives
Recurring Fair Value Measurements
Total net derivative asset/(liability)	1		2
Recurring Fair Value Measures | Level 2 | Preferred Distribution Rate Reset Option
Recurring Fair Value Measurements
Total net derivative asset/(liability)	0		0
Recurring Fair Value Measures | Level 3
Recurring Fair Value Measurements
Total net derivative asset/(liability)	(92)		(29)
Recurring Fair Value Measures | Level 3 | Commodity Derivatives
Recurring Fair Value Measurements
Total net derivative asset/(liability)	(11)		(15)
Recurring Fair Value Measures | Level 3 | Interest Rate Derivatives
Recurring Fair Value Measurements
Total net derivative asset/(liability)	0		0
Recurring Fair Value Measures | Level 3 | Foreign Currency Derivatives
Recurring Fair Value Measurements
Total net derivative asset/(liability)	0		0
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option
Recurring Fair Value Measurements
Total net derivative asset/(liability)	$ (81)		$ (14)

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
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Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

+ References

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Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

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Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative 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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