Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Name:	us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Regulatory Matters - Pending Infrastructure Surcharge Filings Additional Information (Details) - USD ($) $ in Millions	Sep. 16, 2026	Jun. 30, 2026
Missouri
Public Utilities, General Disclosures
Infrastructure surcharge, annualized incremental revenues, requested amount	$ 14
West Virginia
Public Utilities, General Disclosures
Infrastructure surcharge, annualized incremental revenues, requested amount		$ 5