Property, Plant and Equipment (Narrative) (Detail) $ in Millions	1 Months Ended	6 Months Ended
Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) MW
Wexpro \| Natural Gas Gathering Systems \| Colorado, Utah and Wyoming
Property Plant And Equipment [Line Items]
Payments to acquire existing natural gas gathering systems	$ 38
Acquisition of Solar Project at Schools in Virginia
Property Plant And Equipment [Line Items]
Anticipated projected cost		$ 35
Aggregate generation capacity \| MW		18

Capacity of facility of company owned solar distribution generation facilities.

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- Definition

Public utilities, property, plant and equipment, expected cost of construction.

+ References

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- Definition

The cash outflow to purchase long lived physical asset use for the normal oil and gas operations and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

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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.

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