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Redeemable Stocks of Subsidiaries (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Temporary Equity [Line Items]      
Temporary Equity, Other Charges [1] $ 5 $ 7  
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests 863   $ 837
Temporary Equity, Net Income 7 6  
Noncontrolling Interest, Increase from Sale of Parent Equity Interest 6 18  
Colon [Domain]      
Temporary Equity [Line Items]      
Temporary Equity, Other Charges 24 16  
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests [2] 185   159
IPALCO Enterprises, Inc. [Member]      
Temporary Equity [Line Items]      
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests 618   618
IPL Subsidiary [Member]      
Temporary Equity [Line Items]      
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests 60   $ 60
Noncontrolling Interest [Member]      
Temporary Equity [Line Items]      
Temporary Equity, Other Charges [1] 0 0  
Temporary Equity, Net Income 7 6  
Noncontrolling Interest, Increase from Sale of Parent Equity Interest $ 7 $ 22  
[1] Adjustment to record the redeemable stock of Colon at fair value.
[2] (1) Characteristics of quotas are similar to common stock.