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Redeemable Stock of Subsidiaries (Narrative) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
quarter
series
$ / shares
Dec. 31, 2020
USD ($)
Sep. 13, 2021
Dec. 31, 2019
USD ($)
Temporary Equity [Line Items]        
Temporary Equity, Accretion to Redemption Value $ 4 $ 4    
Temporary equity carrying amount 1,257 872   $ 888
Temporary Equity, Other Changes 579 0    
Temporary Equity, Net Income (6) 8    
Redeemable noncontrolling interest, percentage acquired by parent     49.90%  
Noncontrolling Interest [Member]        
Temporary Equity [Line Items]        
Temporary Equity, Other Changes (211) 0    
Colon [Domain]        
Temporary Equity [Line Items]        
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount [1] 0 194    
Redeemable noncontrolling interest, percentage acquired by parent     49.90%  
IPALCO Enterprises, Inc. [Member]        
Temporary Equity [Line Items]        
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount 700 618    
IPL Subsidiary        
Temporary Equity [Line Items]        
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount 60 60    
Temporary equity carrying amount $ 60 60    
Number of preferred stock series | series 5      
Temporary equity annual dividend requirement $ 3 3    
Number of consecutive quarters without paid dividends to invoke board of directors election rule | quarter 4      
IPL Subsidiary | Minimum        
Temporary Equity [Line Items]        
Temporary equity, redemption price per share | $ / shares $ 100      
IPL Subsidiary | Maximum        
Temporary Equity [Line Items]        
Temporary equity, redemption price per share | $ / shares $ 118      
AES Clean Energy        
Temporary Equity [Line Items]        
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount $ 497 0    
sPower [Member]        
Temporary Equity [Line Items]        
Temporary Equity, Other Changes   81    
AES US Investments        
Temporary Equity [Line Items]        
Limited Partners' Contributed Capital 34      
CDPQ        
Temporary Equity [Line Items]        
Limited Partners' Contributed Capital 48      
AIMCo        
Temporary Equity [Line Items]        
Limited Partners' Contributed Capital 240      
Other Comprehensive Income (Loss) [Member]        
Temporary Equity [Line Items]        
Temporary Equity, Other Changes $ 19 $ (28)    
[1] Characteristics of quotas are similar to common stock.