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Redeemable Stocks of Subsidiaries (Details) - USD ($)
$ in Millions
6 Months Ended 9 Months Ended
Jun. 30, 2021
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Temporary Equity [Line Items]        
Redeemable Noncontrolling Interest, Equity, Carrying Amount   $ 1,201 $ 1,257  
Temporary Equity, Other Charges $ 81      
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   424 497  
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   $ 17 $ 0  
Cajuina Wind Complex        
Temporary Equity [Line Items]        
Sale of Stock, Description of Transaction   24    
Sale of Stock, Consideration Received on Transaction   $ 12