Regulatory Matters - Schedule of Additional Significant Riders Associated with Virginia Power Projects (Detail) - Virginia Electric and Power Company $ in Millions	3 Months Ended
Mar. 31, 2022 USD ($)
Rider CCR
Public Utilities General Disclosures [Line Items]
Application Date	2022-02
Approval Date	Pending
Rate Year Beginning	2022-12
Total Revenue Requirement (millions)	$ 231
Increase (decrease) in revenue requirement	$ 15
Rider CE
Public Utilities General Disclosures [Line Items]
Application Date	2021-09
Approval Date	March 2022
Rate Year Beginning	2022-05
Total Revenue Requirement (millions)	$ 71
Increase (decrease) in revenue requirement	$ 61
Rider R
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Approval Date	March 2022
Rate Year Beginning	2022-04
Total Revenue Requirement (millions)	$ 59
Increase (decrease) in revenue requirement	$ 1
Rider R
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Approval Date	March 2022
Rate Year Beginning	2023-04
Total Revenue Requirement (millions)	$ 55
Increase (decrease) in revenue requirement	$ (4)
Rider SNA
Public Utilities General Disclosures [Line Items]
Application Date	2021-10
Approval Date	Pending
Rate Year Beginning	2022-09
Total Revenue Requirement (millions)	$ 107
Rider T1
Public Utilities General Disclosures [Line Items]
Application Date	2022-05
Approval Date	Pending
Rate Year Beginning	2022-09
Total Revenue Requirement (millions)	$ 706
Increase (decrease) in revenue requirement	$ (161)
Rider RGGI
Public Utilities General Disclosures [Line Items]
Application Date	2021-12
Approval Date	Withdrawn
Rider U
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Approval Date	March 2022
Rate Year Beginning	2022-04
Total Revenue Requirement (millions)	$ 95
Increase (decrease) in revenue requirement	$ 15
Rider US-3
Public Utilities General Disclosures [Line Items]
Application Date	2021-08
Approval Date	March 2022
Rate Year Beginning	2022-06
Total Revenue Requirement (millions)	$ 50
Increase (decrease) in revenue requirement	$ 12
Rider US-4
Public Utilities General Disclosures [Line Items]
Application Date	2021-08
Approval Date	March 2022
Rate Year Beginning	2022-06
Total Revenue Requirement (millions)	$ 15
Increase (decrease) in revenue requirement	$ 5

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