Regulatory Matters (Narrative) (Detail 2) - USD ($) $ in Millions	1 Months Ended
	Feb. 23, 2024	Jan. 31, 2024	Sep. 30, 2023	Mar. 31, 2023	Feb. 28, 2023
North Carolina Regulation
Public Utilities, General Disclosures [Line Items]
Approval date				2023-03
North Carolina Regulation | Rider DSM
Public Utilities, General Disclosures [Line Items]
Increase in customer usage tracker			$ 34	$ 23
Public Service Company Of North Carolina | North Carolina Regulation | Rider D
Public Utilities, General Disclosures [Line Items]
Increase (decrease) in gas cost					$ (56)
Approval date					2023-03
Public Service Company Of North Carolina | North Carolina Regulation | Rider D | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Increase (decrease) in gas cost		$ 42
Approval date		2024-01
Virginia Electric and Power Company | Virginia Regulation | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Issuance of deferred bond for under recovery of fuel cost	$ 1,300