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Related Party Transactions - Expenses Incurred and Payments Made to Related Parties (Details) - USD ($) $ in Millions			12 Months Ended
	May 26, 2020	Mar. 09, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Cost of materials and other			$ 3,373	$ 4,851	$ 5,683
Dividends	$ 40	$ 80	121	306	238
Enable | Joint Venture Transportation Agreement
Related Party Transaction [Line Items]
Cost of materials and other			11	12	8
IEP
Related Party Transaction [Line Items]
Dividends	$ 28	$ 57	85	218	179
AEP | Tax Allocation Agreement
Related Party Transaction [Line Items]
Payments (received) made			$ 0	$ (3)	$ 12

X

- Definition

Represents the amount of payment to (proceeds from) related party.

+ References

No definition available.

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- Definition

Cost of material used for good produced and service rendered.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(2))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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