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Regulatory Matters - Summary of Virginia Power Electric Transmission Project Applied (Detail) - Virginia Electric and Power Company $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($) kV mi
Elmont-Ladysmith rebuild and related projects in the Counties of Hanover and Caroline, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2021-04
Approval Date	2022-04
Type of Line \| kV	500
Miles of Lines \| mi	26
Cost Estimate \| $	$ 95
Nimbus line loop and substation and new 230 kV line in the County of Loudon, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2022-02
Type of Line \| kV	230
Miles of Lines \| mi	1
Cost Estimate \| $	$ 40
Build new DTC substation and line loop in the County of Loudoun, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2021-12
Approval Date	2022-07
Type of Line \| kV	230
Miles of Lines \| mi	1
Cost Estimate \| $	$ 105
Partial rebuild of bristers-ox 115 kv line in fauquier and prince william counties, virginia
Public Utilities General Disclosures [Line Items]
Application Date	2022-08
Type of Line \| kV	115
Miles of Lines \| mi	15
Cost Estimate \| $	$ 40