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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Data Type:	xbrli:monetaryItemType
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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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_RelatedPartyTransactionAmountsOfTransaction
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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Balance Type:	na
Period Type:	duration

- 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				3 Months Ended
	Nov. 30, 2020	Jul. 31, 2020	Dec. 31, 2019	Nov. 30, 2019	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Eastern Energy Gas Holdings, LLC [Member] \| Cove Point LNG, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest					75.00%	25.00%
Percentage 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]
Percentage 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]
Percentage 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					$ 26		$ 22
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]
Amounts of transaction					$ 3	$ 4
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]
Amounts of transaction						7
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]
Amounts of transaction						$ 31
Dominion Energy, Inc. [Member] \| Cove Point LNG, LP [Member]
Schedule of Equity Method Investments [Line Items]
Sold noncontrolling partner interest			25.00%