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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- Definition

Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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- Definition

Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=121586364&loc=SL94080555-108585

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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Investments and Restricted Cash and Cash Equivalents and Investments - EEGH - Narrative (Details) - Eastern Energy Gas Holdings, LLC [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Investments And Restricted Cash And Investments [Line Items]
Investment exceeded share of equity in net assets	$ 130		$ 130
Distributions received from investments	$ 10	$ 15
Iroquois Gas Transmission System L.P. [Member]
Investments And Restricted Cash And Investments [Line Items]
Equity method investment, ownership percentage	50.00%
White River Hub, LLC [Member]
Investments And Restricted Cash And Investments [Line Items]
Equity method investment, ownership percentage	50.00%