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Redeemable Stocks of Subsidiaries (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Temporary Equity [Line Items]      
Redeemable Noncontrolling Interest, Equity, Carrying Amount $ 1,134 $ 1,257  
AIMco      
Temporary Equity [Line Items]      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     25.00%
Cajuina Wind Complex      
Temporary Equity [Line Items]      
Noncontrolling Interest, Ownership Percentage by Parent 35.50%    
IPALCO Enterprises, Inc. [Member]      
Temporary Equity [Line Items]      
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount $ 700 700  
Clean Energy      
Temporary Equity [Line Items]      
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount 362 497  
IPL Subsidiary [Member]      
Temporary Equity [Line Items]      
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount 60 60  
Potengi      
Temporary Equity [Line Items]      
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount $ 12 $ 0  
Cajuina Wind Complex      
Temporary Equity [Line Items]      
Sale of Stock, Description of Transaction 24    
Sale of Stock, Consideration Received on Transaction $ 12