Nature of Business and Basis of Presentation (Details) customer in Millions	6 Months Ended
Jun. 30, 2026 dth customer GW	Jan. 30, 2026 state facility GW
Business Combination [Line Items]
Generation capacity (in GW) \| GW	25
Generation capacity (MMDth) annually \| dth	1,900,000,000
LS Power Portfolio
Business Combination [Line Items]
Generation capacity (in GW) \| GW	13	13
Number of gas-fired facilities acquired \| facility		18
States where entity is located \| state		9
Residential Customers
Business Combination [Line Items]
Customers	8
Residential Customers, Retail Energy
Business Combination [Line Items]
Customers	6
Residential Customers , Smart Home
Business Combination [Line Items]
Customers	2

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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