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Redeemable Stocks of Subsidiaries (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Temporary Equity [Line Items]      
Temporary Equity, Other Charges [1] $ (4) $ (19)  
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests 879   $ 837
Temporary Equity, Net Income 3 9  
Noncontrolling Interest, Increase from Sale of Parent Equity Interest 20 69  
Colon [Domain]      
Temporary Equity [Line Items]      
Temporary Equity, Other Charges 34 30  
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests [2] 201   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 3 9  
Noncontrolling Interest, Increase from Sale of Parent Equity Interest $ 21 $ 47  
[1] Adjustment to record the redeemable stock of Colon at fair value.
[2] (1) Characteristics of quotas are similar to common stock.