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Redeemable Stocks of Subsidiaries (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended 9 Months Ended
Mar. 31, 2016
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Temporary Equity [Line Items]          
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests     $ 967   $ 782
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     6.70%    
Temporary Equity, Net Income     $ 9 $ 8  
Noncontrolling Interest, Increase from Sale of Parent Equity Interest     69 17  
Eletropaulo [Domain]          
Temporary Equity [Line Items]          
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests     152   0
Colon [Domain]          
Temporary Equity [Line Items]          
Temporary Equity, Other Charges     30 106  
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests [1]     137   100
IPALCO Enterprises, Inc. [Member]          
Temporary Equity [Line Items]          
Temporary Equity, Other Charges   $ 24      
Temporary Equity, Stock Issued During Period, Value, New Issues $ 134        
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
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.