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Redeemable Stocks of Subsidiaries (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Temporary Equity [Line Items]      
Redeemable Noncontrolling Interest, Equity, Carrying Amount $ 896   $ 879
Colon [Domain]      
Temporary Equity [Line Items]      
Temporary Equity, Other Charges 10 $ 24  
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount [1] 218   201
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
[1]
(1) 
Characteristics of quotas are similar to common stock.