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Redeemable Stock of Subsidiaries (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2024
Dec. 31, 2021
Temporary Equity [Line Items]                
Redeemable Preferred Stock Dividends       $ (61) $ (62) $ (64)    
Temporary equity carrying amount       938 1,464 1,321   $ 1,257
Temporary Equity, Stock Issued During Period, Value, New Issues       197 100 168    
Temporary Equity, Net Income       (86) (59) (87)    
Temporary Equity, Interest in Subsidiary Earnings       105 163 67    
Sale of Stock, Consideration Received on Transaction $ 63              
Redeemable stock of subsidiaries     $ 901 938 1,464   $ 905  
Redeemable Noncontrolling Interest, Equity, Other, Carrying Amount       (736) 0 0    
Temporary Equity, Elimination as Part of Reorganization       (18) 0 0    
Potengi                
Temporary Equity [Line Items]                
Noncontrolling Interest, Ownership Percentage by Parent   35.50%            
Noncontrolling Interest [Member]                
Temporary Equity [Line Items]                
Temporary Equity, Other Changes       0 0 (60)    
IPALCO Enterprises, Inc. [Member]                
Temporary Equity [Line Items]                
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount       835 773      
IPL Subsidiary                
Temporary Equity [Line Items]                
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount           60    
AES Clean Energy                
Temporary Equity [Line Items]                
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount       0 544      
CDPQ                
Temporary Equity [Line Items]                
Temporary Equity, Interest in Subsidiary Earnings       68   77    
AES Clean Energy Development                
Temporary Equity [Line Items]                
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount       65 129      
Temporary Equity, Stock Issued During Period, Value, New Issues       159 100 157    
Noncontrolling Interest, Increase from Subsidiary Equity Issuance       159        
Potengi                
Temporary Equity [Line Items]                
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount       0 18      
Sale of Stock, Description of Transaction   24            
Sale of Stock, Consideration Received on Transaction   $ 12            
AES Indiana                
Temporary Equity [Line Items]                
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount       38 0      
AES Clean Energy Development                
Temporary Equity [Line Items]                
Reclassifications of Temporary to Permanent Equity     $ 577          
Other Comprehensive Income (Loss) [Member]                
Temporary Equity [Line Items]                
Temporary Equity, Other Changes       $ 73 $ 1 $ 40