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Redeemable Stocks of Subsidiaries (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Temporary Equity [Line Items]    
Redeemable Noncontrolling Interest, Equity, Carrying Amount $ 1,033 $ 872
AIMco    
Temporary Equity [Line Items]    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 25.00%  
Colon [Domain]    
Temporary Equity [Line Items]    
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount [1] $ 180 194
IPALCO Enterprises, Inc. [Member]    
Temporary Equity [Line Items]    
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount 618 618
IPL Subsidiary [Member]    
Temporary Equity [Line Items]    
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount 60 60
Clean Energy    
Temporary Equity [Line Items]    
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount $ 175 $ 0
[1] Characteristics of quotas are similar to common stock.