Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Sold

No definition available.

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- Definition

Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders, Ownership Percentage Distributed

+ References

No definition available.

+ Details

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- Definition

Carrying amount as of the balance sheet date of obligations due all related parties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.17)
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(3),(4))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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Balance Type:	credit
Period Type:	instant

- Definition

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

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- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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.

+ Details

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685

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Variable-Interest Entities - EEGH (Details) - USD ($) $ in Millions		1 Months Ended				12 Months Ended
	Nov. 06, 2019	Nov. 30, 2020	Jul. 31, 2020	Dec. 31, 2019	Jun. 30, 2015	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Eastern Energy Gas Holdings, LLC [Member] \| Cove Point LNG, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest					75.00%
Noncontrolling interest distributed			25.00%
Eastern Energy Gas Holdings, LLC [Member] \| General Partner [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Cove Point LNG, LP [Member]
Schedule of Equity Method Investments [Line Items]
Variable interest entity, ownership percentage						100.00%
Eastern Energy Gas Holdings, LLC [Member] \| Limited Partner [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Cove Point LNG, LP [Member]
Schedule of Equity Method Investments [Line Items]
Variable interest entity, ownership percentage						25.00%
Eastern Energy Gas Holdings, LLC [Member] \| Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations [Member] \| GT&S Transaction [Member] \| Cove Point LNG, LP [Member]
Schedule of Equity Method Investments [Line Items]
Noncontrolling interest distributed		50.00%
Eastern Energy Gas Holdings, LLC [Member] \| Cove Point LNG, LP [Member] \| Dominion Energy, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest				75.00%
Eastern Energy Gas Holdings, LLC [Member] \| Cove Point LNG, LP [Member] \| Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations [Member] \| GT&S Transaction [Member]
Schedule of Equity Method Investments [Line Items]
Noncontrolling interest distributed		50.00%
Eastern Energy Gas Holdings, LLC [Member] \| Carolina Gas Services, Inc. [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Due to related parties				$ 9		$ 22	$ 9
Eastern Energy Gas Holdings, LLC [Member] \| Carolina Gas Services, Inc. [Member] \| Shared Services [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Related party amounts of transaction						12	16	$ 16
Eastern Energy Gas Holdings, LLC [Member] \| Dominion Energy Questar Pipeline Services, Inc. [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Due to related parties				6			6
Eastern Energy Gas Holdings, LLC [Member] \| Dominion Energy Questar Pipeline Services, Inc. [Member] \| Shared Services [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Related party amounts of transaction						23	33	29
Eastern Energy Gas Holdings, LLC [Member] \| Dominion Energy Services, Inc. [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Due to related parties				$ 27			27
Eastern Energy Gas Holdings, LLC [Member] \| Dominion Energy Services, Inc. [Member] \| Shared Services [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Related party amounts of transaction						$ 90	$ 119	$ 106
Dominion Energy, Inc. [Member] \| Cove Point LNG, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	25.00%	50.00%				50.00%
Dominion Energy, Inc. [Member] \| Cove Point LNG, LP [Member]
Schedule of Equity Method Investments [Line Items]
Sold noncontrolling partner interest				25.00%