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Regulatory Matters - Schedule of Additional Significant Riders Associated with Virginia Power Projects (Detail) - Virginia Electric and Power Company $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Rider BW
Public Utilities General Disclosures [Line Items]
Application Date	2021-10
Approval Date	Pending
Rate Year Beginning	2023-09
Total Revenue Requirement (millions)	$ 120
Increase (decrease) in revenue requirement	$ (25)
Rider B
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Approval Date	February 2022
Rate Year Beginning	2022-04
Total Revenue Requirement (millions)	$ 16
Increase (decrease) in revenue requirement	$ (8)
Rider E
Public Utilities General Disclosures [Line Items]
Application Date	2021-01
Approval Date	September 2021
Rate Year Beginning	2021-11
Total Revenue Requirement (millions)	$ 67
Increase (decrease) in revenue requirement	$ (18)
Rider B
Public Utilities General Disclosures [Line Items]
Application Date	2020-06
Approval Date	February 2021
Rate Year Beginning	2021-04
Total Revenue Requirement (millions)	$ 24
Increase (decrease) in revenue requirement	$ (8)
Rider GV
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Approval Date	December 2021
Rate Year Beginning	2023-04
Total Revenue Requirement (millions)	$ 127
Increase (decrease) in revenue requirement	$ (15)
Rider BW
Public Utilities General Disclosures [Line Items]
Application Date	2021-10
Approval Date	Pending
Rate Year Beginning	2022-09
Total Revenue Requirement (millions)	$ 145
Increase (decrease) in revenue requirement	$ 32
Rider R
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Approval Date	Pending
Rate Year Beginning	2022-04
Total Revenue Requirement (millions)	$ 59
Increase (decrease) in revenue requirement	$ 1
Rider S
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Approval Date	February 2022
Rate Year Beginning	2022-04
Total Revenue Requirement (millions)	$ 192
Increase (decrease) in revenue requirement	$ (2)
Rider W
Public Utilities General Disclosures [Line Items]
Application Date	2020-06
Approval Date	February 2021
Rate Year Beginning	2021-04
Total Revenue Requirement (millions)	$ 120
Increase (decrease) in revenue requirement	$ 14
Rider US-2
Public Utilities General Disclosures [Line Items]
Application Date	2020-10
Approval Date	July 2021
Rate Year Beginning	2021-09
Total Revenue Requirement (millions)	$ 9
Rider CCR
Public Utilities General Disclosures [Line Items]
Application Date	2021-02
Approval Date	October 2021
Rate Year Beginning	2021-12
Total Revenue Requirement (millions)	$ 216
Rider US-2
Public Utilities General Disclosures [Line Items]
Application Date	2021-10
Approval Date	Pending
Rate Year Beginning	2022-09
Total Revenue Requirement (millions)	$ 11
Increase (decrease) in revenue requirement	$ 2
Rider BW
Public Utilities General Disclosures [Line Items]
Application Date	2020-10
Approval Date	July 2021
Rate Year Beginning	2021-09
Total Revenue Requirement (millions)	$ 113
Increase (decrease) in revenue requirement	$ 14
Rider CE
Public Utilities General Disclosures [Line Items]
Application Date	2020-10
Approval Date	April 2021
Rate Year Beginning	2021-06
Total Revenue Requirement (millions)	$ 10
Rider CE
Public Utilities General Disclosures [Line Items]
Application Date	2021-09
Approval Date	Pending
Rate Year Beginning	2022-05
Total Revenue Requirement (millions)	$ 71
Increase (decrease) in revenue requirement	$ 61
Rider E
Public Utilities General Disclosures [Line Items]
Application Date	2022-01
Approval Date	Pending
Rate Year Beginning	2022-11
Total Revenue Requirement (millions)	$ 101
Increase (decrease) in revenue requirement	$ 34
Rider US-3
Public Utilities General Disclosures [Line Items]
Application Date	2020-07
Approval Date	March 2021
Rate Year Beginning	2021-06
Total Revenue Requirement (millions)	$ 38
Increase (decrease) in revenue requirement	$ 10
Rider GT
Public Utilities General Disclosures [Line Items]
Application Date	2021-08
Approval Date	Pending
Rate Year Beginning	2022-06
Total Revenue Requirement (millions)	$ 56
Rider GV
Public Utilities General Disclosures [Line Items]
Application Date	2020-06
Approval Date	February 2021
Rate Year Beginning	2021-04
Total Revenue Requirement (millions)	$ 153
Increase (decrease) in revenue requirement	$ 21
Rider GV
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Approval Date	December 2021
Rate Year Beginning	2022-04
Total Revenue Requirement (millions)	$ 142
Increase (decrease) in revenue requirement	$ (11)
Rider OSW
Public Utilities General Disclosures [Line Items]
Application Date	2021-11
Approval Date	Pending
Rate Year Beginning	2022-09
Total Revenue Requirement (millions)	$ 79
Rider R
Public Utilities General Disclosures [Line Items]
Application Date	2020-06
Approval Date	February 2021
Rate Year Beginning	2021-04
Total Revenue Requirement (millions)	$ 58
Increase (decrease) in revenue requirement	$ 14
Rider US-3
Public Utilities General Disclosures [Line Items]
Application Date	2021-08
Approval Date	Pending
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	2020-07
Approval Date	March 2021
Rate Year Beginning	2021-06
Total Revenue Requirement (millions)	$ 10
Increase (decrease) in revenue requirement	$ 3
Rider R
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Approval Date	Pending
Rate Year Beginning	2023-04
Total Revenue Requirement (millions)	$ 55
Increase (decrease) in revenue requirement	$ (4)
Rider US-4
Public Utilities General Disclosures [Line Items]
Application Date	2021-08
Approval Date	Pending
Rate Year Beginning	2022-06
Total Revenue Requirement (millions)	$ 15
Increase (decrease) in revenue requirement	$ 5
Rider RGGI
Public Utilities General Disclosures [Line Items]
Approval Date	August 2021
Rate Year Beginning	2021-09
Total Revenue Requirement (millions)	$ 168
Rider RGGI
Public Utilities General Disclosures [Line Items]
Application Date	2021-12
Approval Date	Withdrawal pending
Rider RPS
Public Utilities General Disclosures [Line Items]
Application Date	2020-12
Approval Date	July 2021
Rate Year Beginning	2021-08
Total Revenue Requirement (millions)	$ 13
Rider RPS
Public Utilities General Disclosures [Line Items]
Application Date	2021-12
Approval Date	Pending
Rate Year Beginning	2022-09
Total Revenue Requirement (millions)	$ 140
Increase (decrease) in revenue requirement	$ 127
Rider S
Public Utilities General Disclosures [Line Items]
Application Date	2020-06
Approval Date	February 2021
Rate Year Beginning	2021-04
Total Revenue Requirement (millions)	$ 194
Increase (decrease) in revenue requirement	$ (1)
Rider S
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Approval Date	February 2022
Rate Year Beginning	2023-04
Total Revenue Requirement (millions)	$ 191
Increase (decrease) in revenue requirement	$ (1)
Rider SNA
Public Utilities General Disclosures [Line Items]
Application Date	2021-10
Approval Date	Pending
Rate Year Beginning	2022-09
Total Revenue Requirement (millions)	$ 109
Rider T1
Public Utilities General Disclosures [Line Items]
Application Date	2021-05
Approval Date	August 2021
Rate Year Beginning	2021-09
Total Revenue Requirement (millions)	$ 874
Increase (decrease) in revenue requirement	$ (190)
Rider U
Public Utilities General Disclosures [Line Items]
Application Date	2020-06
Approval Date	February 2021
Rate Year Beginning	2021-04
Total Revenue Requirement (millions)	$ 80
Increase (decrease) in revenue requirement	$ 28
Rider U
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Approval Date	Pending
Rate Year Beginning	2022-04
Total Revenue Requirement (millions)	$ 96
Increase (decrease) in revenue requirement	$ 16
Rider W
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Approval Date	February 2022
Rate Year Beginning	2022-04
Total Revenue Requirement (millions)	$ 121
Increase (decrease) in revenue requirement	$ 1
DSM Riders [Member]
Public Utilities General Disclosures [Line Items]
Application Date	2020-12
Approval Date	September 2021
Rate Year Beginning	2021-10
Total Revenue Requirement (millions)	$ 74
Increase (decrease) in revenue requirement	$ 14
DSM Riders [Member]
Public Utilities General Disclosures [Line Items]
Application Date	2021-12
Approval Date	Pending
Rate Year Beginning	2022-09
Total Revenue Requirement (millions)	$ 91
Increase (decrease) in revenue requirement	$ 17

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