Regulatory Matters - Schedule of Annualized Incremental Revenues (Details) - USD ($) $ in Millions					6 Months Ended
	Jul. 01, 2026	Jun. 30, 2026	Apr. 01, 2026	Jan. 01, 2026	Jun. 30, 2026
Public Utilities, General Disclosures
Total infrastructure surcharge authorizations					$ 105
Missouri \| Public Utility, Authorization, Effective Date, August 15, 2026
Public Utilities, General Disclosures
Total infrastructure surcharge authorizations					18
Missouri \| Public Utility, Authorization, Effective Date, March 1, 2026
Public Utilities, General Disclosures
Total infrastructure surcharge authorizations					13
Pennsylvania
Public Utilities, General Disclosures
Total infrastructure surcharge authorizations					27
Infrastructure surcharge, annualized incremental revenues, authorized amount			$ 7	$ 11
Pennsylvania \| Subsequent Event
Public Utilities, General Disclosures
Infrastructure surcharge, annualized incremental revenues, authorized amount	$ 9
New Jersey
Public Utilities, General Disclosures
Total infrastructure surcharge authorizations					25
Indiana
Public Utilities, General Disclosures
Total infrastructure surcharge authorizations					15
West Virginia
Public Utilities, General Disclosures
Total infrastructure surcharge authorizations					2
Infrastructure surcharge, annualized incremental revenues, authorized amount		$ 5
Illinois
Public Utilities, General Disclosures
Total infrastructure surcharge authorizations					$ 5