Background and Basis of Presentation (Details)	1 Months Ended	3 Months Ended
Jan. 31, 2017 a	Mar. 31, 2019 mi
Leases
Length of pipeline to supply gas \| mi		137
City Of Texas City and State Of Texas (Galveston Bay) \| Surface leases
Leases
Term of lease agreement	36 months
Area of land leased \| a	994

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration