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Redeemable Stocks of Subsidiaries (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Temporary Equity [Line Items]                
Temporary Equity, Contributions to redeemable Stock of Subsidiaries         $ 130 $ 0    
Temporary Equity, Stock Issued During Period, Value, New Issues         134 460    
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests     $ 775 $ 538 775 538 $ 538 $ 78
Capital Contributions From Noncontrolling Interests         23 117    
Temporary Equity, Accretion to Redemption Value [1]         4 0    
Temporary Equity, Net Income     (3) 0 (8) 0    
Redeemable Preferred Stock [Member]                
Temporary Equity [Line Items]                
Temporary Equity Reclassification     (23) $ 0 (23) $ 0    
Colon [Domain]                
Temporary Equity [Line Items]                
Temporary Equity, Contributions to redeemable Stock of Subsidiaries         83      
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests     $ 97   97   $ 0  
Temporary Equity, Accretion to Redemption Value         1      
Temporary Equity, Carrying Amount, Period Increase (Decrease)         $ 23      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     49.90%   49.90%   25.00%  
IPALCO Enterprises, Inc. [Member]                
Temporary Equity [Line Items]                
Temporary Equity, Contributions to redeemable Stock of Subsidiaries $ 24              
Temporary Equity, Stock Issued During Period, Value, New Issues   $ 134            
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests     $ 618   $ 618   $ 460  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     30.00%   30.00%      
IPL Subsidiary [Member]                
Temporary Equity [Line Items]                
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests     $ 60   $ 60   60  
DPL Subsidiary [Member]                
Temporary Equity [Line Items]                
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests     0   0   $ 18  
Temporary Equity, Accretion to Redemption Value     5   5      
DPL Subsidiary [Member] | Redeemable Preferred Stock [Member]                
Temporary Equity [Line Items]                
Redeemable Noncontrolling Interest, Equity, Preferred, Redemption Value     $ 23   $ 23      
[1] (1) $5 million increase in fair value of DP&L preferred shares offset by $1 million decrease in fair value of Colon common stock.