Preferred Stock (Carrying Value Of Cumulative Preferred Stock) (Details) - IPL [Member] - Cumulative Preferred Stock [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021
Temporary Equity [Line Items]
Shares Authorized (in shares)		16,000,000
5.1% [Member]
Temporary Equity [Line Items]
Series	5.10%
Liquidation Preference/Stated Value (in dollars per share)	$ 25
Shares Authorized (in shares)	8,000,000
Preferred Stock, Shares Outstanding	8,000,000
Cumulative preferred stock	$ 200