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Related Party Transactions - Expenses from Related Parties (Details) - USD ($) $ in Millions						3 Months Ended		12 Months Ended
	Mar. 09, 2020	Nov. 11, 2019	Aug. 12, 2019	May 13, 2019	Mar. 11, 2019	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Cost of materials and other						$ 1,058	$ 1,101
Dividends	$ 80	$ 80	$ 75	$ 75	$ 75	80	75	$ 307
Enable | Joint Venture Transportation Agreement
Related Party Transaction [Line Items]
Cost of materials and other						3	2
IEP
Related Party Transaction [Line Items]
Dividends	$ 57	$ 57	$ 53	$ 53	$ 53	$ 57	$ 54	$ 217

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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=116634182&loc=SL114868664-224227

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+ 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
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-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

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+ References

No definition available.

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