Regulatory Matters - Schedule of Generate Rate Cases and Infrastructure Surcharges (Details) $ in Millions	6 Months Ended
	Jun. 30, 2026 USD ($)
Public Utilities, General Disclosures
General rate case authorizations, annualized incremental revenues, including reduction for the amortization of the excess accumulated deferred income taxes	$ 111
Pennsylvania
Public Utilities, General Disclosures
General rate case authorizations, annualized incremental revenues, including reduction for the amortization of the excess accumulated deferred income taxes	75
West Virginia
Public Utilities, General Disclosures
General rate case authorizations, annualized incremental revenues, including reduction for the amortization of the excess accumulated deferred income taxes	20
Maryland
Public Utilities, General Disclosures
General rate case authorizations, annualized incremental revenues, including reduction for the amortization of the excess accumulated deferred income taxes	2
California, Attrition Increase
Public Utilities, General Disclosures
General rate case authorizations, annualized incremental revenues, including reduction for the amortization of the excess accumulated deferred income taxes	$ 14