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Regulatory Matters - Schedule of Additional Significant Riders Associated with Virginia Power Projects (Parenthetical) (Detail) - Virginia Electric and Power Company - USD ($) $ in Millions	1 Months Ended				6 Months Ended
	Jun. 30, 2022	May 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Jun. 30, 2022
Rider SNA
Public Utilities General Disclosures [Line Items]
Total revenue requirement					$ 107
Rider T1
Public Utilities General Disclosures [Line Items]
Total revenue requirement					706
Rider U
Public Utilities General Disclosures [Line Items]
Total revenue requirement					$ 95
Virginia Regulation | Previous Phase
Public Utilities General Disclosures [Line Items]
Projected capital investment	$ 74			$ 60
Virginia Regulation | Rider SNA | Operating Segments | Transmission Component Of Virginia Powers
Public Utilities General Disclosures [Line Items]
Projected capital investment			$ 1,200
Virginia Regulation | Rider T1 | Operating Segments
Public Utilities General Disclosures [Line Items]
Total revenue requirement		$ 224
Virginia Regulation | Rider T1 | Operating Segments | Transmission Component Of Virginia Powers
Public Utilities General Disclosures [Line Items]
Total revenue requirement		$ 482
Virginia Regulation | Rider U | Previous Phase
Public Utilities General Disclosures [Line Items]
Projected capital investment				$ 35

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382

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