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Redeemable Stocks of Subsidiaries (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Temporary Equity [Line Items]          
Temporary Equity, Other Charges   $ (1) $ 0    
Temporary Equity, Stock Issued During Period, Value, New Issues   0 134    
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests $ 672 $ 774 672 $ 782 $ 538
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   6.70%      
Temporary Equity, Net Income   $ (3) 0    
Noncontrolling Interest, Increase from Sale of Parent Equity Interest   18 17    
Redeemable Preferred Stock [Member]          
Temporary Equity [Line Items]          
Temporary Equity Reclassification 0 (4) $ 0    
Colon [Domain]          
Temporary Equity [Line Items]          
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests [1]   96   100  
IPALCO Enterprises, Inc. [Member]          
Temporary Equity [Line Items]          
Temporary Equity, Stock Issued During Period, Value, New Issues $ 134        
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests   618   618  
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  
Other Entity [Member]          
Temporary Equity [Line Items]          
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests   $ 0   $ 4  
IPALCO Enterprises, Inc. [Member] | Additional Paid-in Capital [Member]          
Temporary Equity [Line Items]          
Noncontrolling Interest, Increase from Sale of Parent Equity Interest     $ 84    
IPALCO Enterprises, Inc. [Member] | Retained Earnings [Member]          
Temporary Equity [Line Items]          
Noncontrolling Interest, Increase from Sale of Parent Equity Interest     $ (84)    
[1] (1) Characteristics of quotas are similar to common stock.