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Preferred Stock (Tables)
12 Months Ended
Dec. 31, 2021
Class of Stock [Line Items]  
Schedule of Carrying Value of Cumulative Preferred Stock Information related to IPL’s cumulative preferred stock at December 31, 2020 was as follows (dollars in millions):
SeriesLiquidation Preference/Stated ValueShares AuthorizedShares OutstandingCarrying Value
5.1%$258,000,0008,000,000$200
IPL [Member]  
Class of Stock [Line Items]  
Schedule of Carrying Value of Cumulative Preferred Stock Information related to IPL’s cumulative preferred stock at December 31, 2020 was as follows (dollars in millions):
SeriesLiquidation Preference/Stated ValueShares AuthorizedShares OutstandingCarrying Value
5.1%$258,000,0008,000,000$200