Regulatory Matters - General Rate Cases (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Public Utilities, General Disclosures
General rate case authorizations, annualized incremental revenues, including reduction for the amortization of the excess accumulated deferred income taxes	$ 138
Virginia
Public Utilities, General Disclosures
General rate case authorizations, annualized incremental revenues, including reduction for the amortization of the excess accumulated deferred income taxes	15
Tennessee
Public Utilities, General Disclosures
General rate case authorizations, annualized incremental revenues, including reduction for the amortization of the excess accumulated deferred income taxes	1
CALIFORNIA
Public Utilities, General Disclosures
General rate case authorizations, annualized incremental revenues, including reduction for the amortization of the excess accumulated deferred income taxes	17
Illinois
Public Utilities, General Disclosures
General rate case authorizations, annualized incremental revenues, including reduction for the amortization of the excess accumulated deferred income taxes	$ 105