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Debt - Non-Recourse Debt Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Debt Instrument [Line Items]        
Debt defaults at risk of causing cross default 0   0  
Loss on extinguishment of debt $ (16) $ (20) $ (12) $ (161)
Proceeds from Lines of Credit     1,079 $ 677
Parent Company [Member]        
Debt Instrument [Line Items]        
Loss on extinguishment of debt     7  
Nonrecourse Debt [Member]        
Debt Instrument [Line Items]        
Loss on extinguishment of debt     1  
Issued new debt 2,384   2,384  
Repayments of Debt     (2,038)  
Nonrecourse Debt [Member] | Gener Subsidiary [Member]        
Debt Instrument [Line Items]        
Loss on extinguishment of debt     7  
Issued new debt 619   619  
Repayments of Debt     (279)  
Nonrecourse Debt [Member] | Los Mina [Member]        
Debt Instrument [Line Items]        
Loss on extinguishment of debt     0  
Issued new debt 118   118  
Repayments of Debt     0  
Nonrecourse Debt [Member] | Itabo Opco [Member]        
Debt Instrument [Line Items]        
Loss on extinguishment of debt     (1)  
Issued new debt 100   100  
Repayments of Debt     (70)  
Nonrecourse Debt [Member] | Maritza [Member]        
Debt Instrument [Line Items]        
Loss on extinguishment of debt     0  
Issued new debt 18   18  
Repayments of Debt     (136)  
Nonrecourse Debt [Member] | Andres [Member]        
Debt Instrument [Line Items]        
Loss on extinguishment of debt     (2)  
Issued new debt 220   220  
Repayments of Debt     (180)  
Nonrecourse Debt [Member] | IPALCO Enterprises, Inc. [Member]        
Debt Instrument [Line Items]        
Loss on extinguishment of debt     0  
Issued new debt 598   598  
Repayments of Debt     (390)  
Nonrecourse Debt [Member] | Other Subsidiaries [Member]        
Debt Instrument [Line Items]        
Loss on extinguishment of debt     0  
Issued new debt 266   266  
Repayments of Debt     (462)  
Nonrecourse Debt [Member] | DPL Subsidiary [Member]        
Debt Instrument [Line Items]        
Loss on extinguishment of debt     3  
Issued new debt $ 445   445  
Repayments of Debt     $ (521)