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Regulatory Matters - Summary of Virginia Power Electric Transmission Project Applied (Detail) - Virginia Electric and Power Company $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) kV mi
Bristers-Ladysmith Rebuild Project in the counties of Fauquier, Stafford, Spotsylvania, and Caroline, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2020-05
Approval Date	2021-02
Type of Line | kV	500
Miles of Lines | mi	37
Cost Estimate | $	$ 110
Relocate and replace a transmission line underground between the Tysons substation and the future Spring Hill substation
Public Utilities General Disclosures [Line Items]
Application Date	2020-09
Approval Date	2021-06
Type of Line | kV	230
Cost Estimate | $	$ 30
Rebuild an Existing Transmission Line and Install New Line Adjacent thereto in Counties of New Kent, King William, King and Queen Essex and Richmond, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2020-10
Approval Date	2021-12
Type of Line | kV	230
Miles of Lines | mi	41
Cost Estimate | $	$ 100
Rebuild Clubhouse - Dry Bread Line and Dry Bread Lakeview Line in Greensville County, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2020-11
Approval Date	2021-07
Type of Line | kV	230
Miles of Lines | mi	13
Cost Estimate | $	$ 20
Rebuild transmission lines and related projects in the Counties of York and James City and the City of Williamsburg, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2021-01
Approval Date	2021-09
Type of Line | kV	230
Miles of Lines | mi	11
Cost Estimate | $	$ 30
Elmont-Ladysmith rebuild and related projects in the Counties of Hanover and Caroline, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2021-04
Type of Line | kV	500
Miles of Lines | mi	26
Cost Estimate | $	$ 95
Approval Date	Pending
Beaumeade-Belmont reconductor and rebuild projects in the County of Loudoun, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2021-05
Type of Line | kV	230
Miles of Lines | mi	7
Cost Estimate | $	$ 15
Approval Date	February 2022
Rebuild transmission lines and related projects in the City of Staunton and County of Augusta, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2021-11
Type of Line | kV	230
Miles of Lines | mi	21
Cost Estimate | $	$ 45
Approval Date	Pending
Extension to Cloud Switching Station and Easters Switching Station in the County of Mecklenburg, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2021-06
Type of Line | kV	230
Miles of Lines | mi	15
Cost Estimate | $	$ 105
Approval Date	February 2022
Build new DTC substation and line loop in the County of Loudoun, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2021-12
Type of Line | kV	230
Miles of Lines | mi	1
Cost Estimate | $	$ 105
Approval Date	Pending
Build new Aviator substation and line loop in the County of Loudoun, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2022-02
Type of Line | kV	230
Miles of Lines | mi	1
Cost Estimate | $	$ 80
Approval Date	Pending

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