v3.25.2
Debt (Credit Facilities) (Details)
$ in Millions
Jun. 30, 2025
USD ($)
Debt [Line Items]  
Amount outstanding $ 292
Weighted average interest rates 4.60%
Available credit facility capacity $ 1,008
IPL [Member]  
Debt [Line Items]  
Amount outstanding 0
Available credit facility capacity 350
WPL [Member]  
Debt [Line Items]  
Amount outstanding $ 292
Weighted average interest rates 4.60%
Available credit facility capacity $ 108