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Debt - Non-Recourse Debt Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Debt Instrument [Line Items]        
Debt defaults at risk of causing cross default 0   0  
Loss on extinguishment of debt $ 20 $ 47 $ 165 $ 196
Proceeds from Lines of Credit     677 $ 758
Nonrecourse Debt [Member] | Gener Subsidiary [Member]        
Debt Instrument [Line Items]        
Issued new debt 575   575  
Nonrecourse Debt [Member] | Sul Subsidiary [Member]        
Debt Instrument [Line Items]        
Loss on extinguishment of debt     4  
Issued new debt 499   499  
Repayments of Debt     470  
Nonrecourse Debt [Member] | IPALCO Enterprises, Inc. [Member]        
Debt Instrument [Line Items]        
Loss on extinguishment of debt     22  
Issued new debt 665   665  
Repayments of Debt     420  
Nonrecourse Debt [Member] | PANAMA        
Debt Instrument [Line Items]        
Loss on extinguishment of debt     15  
Issued new debt 300   300  
Repayments of Debt     287  
Nonrecourse Debt [Member] | Cochrane Subsidiary [Member]        
Debt Instrument [Line Items]        
Proceeds from Lines of Credit     308  
Nonrecourse Debt [Member] | Ventanas [Member]        
Debt Instrument [Line Items]        
Loss on extinguishment of debt     6  
Repayments of Debt     308  
Nonrecourse Debt [Member] | Eletropaulo [Domain]        
Debt Instrument [Line Items]        
Issued new debt 268   268  
Repayments of Debt     121  
Nonrecourse Debt [Member] | Mong Duong Subsidiary [Member]        
Debt Instrument [Line Items]        
Proceeds from Lines of Credit     203  
Nonrecourse Debt [Member] | DPL Subsidiary [Member]        
Debt Instrument [Line Items]        
Loss on extinguishment of debt     2  
Issued new debt $ 325   325  
Repayments of Debt     $ 474