Summary Of Significant Accounting Policies (Schedule Of Average Rates Of Depreciation) (Details)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Electric - generation [Member] | IPL [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Average rate of depreciation, percent		3.30%	3.30%	3.40%
Electric - generation [Member] | IPL [Member] | Forecast [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Average rate of depreciation, percent	3.80%
Electric - generation [Member] | WPL [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Average rate of depreciation, percent		3.40%	3.00%	3.40%
Electric - distribution [Member] | IPL [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Average rate of depreciation, percent		2.80%	2.80%	2.80%
Electric - distribution [Member] | IPL [Member] | Forecast [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Average rate of depreciation, percent	3.00%
Electric - distribution [Member] | WPL [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Average rate of depreciation, percent		2.70%	2.70%	2.50%
Electric - other [Member] | IPL [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Average rate of depreciation, percent		5.20%	5.60%	5.70%
Electric - other [Member] | WPL [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Average rate of depreciation, percent		6.10%	6.30%	6.80%
Gas [Member] | IPL [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Average rate of depreciation, percent		3.30%	3.30%	3.30%
Gas [Member] | WPL [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Average rate of depreciation, percent		2.50%	2.50%	2.40%
Other [Member] | IPL [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Average rate of depreciation, percent		4.60%	6.20%	6.10%
Other [Member] | WPL [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Average rate of depreciation, percent		4.40%	4.60%	4.90%