Related Party Transactions - EEGH - Significant Transactions (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Capitalized expenditures	$ 6,765	$ 7,364	$ 6,241
Eastern Energy Gas Holdings, LLC [Member]
Related Party Transaction [Line Items]
Capitalized expenditures	374	704	1,109
Eastern Energy Gas Holdings, LLC [Member] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Revenue from related parties	207	249	168
Purchases of natural gas and transportation and storage services	10	12	0
Services provided by related parties	129	226	169
Capitalized expenditures	14	19	37
Eastern Energy Gas Holdings, LLC [Member] \| Affiliated Entity [Member] \| Atlantic Coast Pipeline [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 83	$ 164	$ 260

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 220
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