Background and Basis of Presentation (Details)	1 Months Ended	6 Months Ended
Jan. 31, 2017 a	Jun. 30, 2019 mi
Leases
Length of pipeline to supply gas \| mi		137
City Of Texas City and State Of Texas (Galveston Bay) \| Surface leases
Leases
Area of land leased \| a	994

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.

No definition available.

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