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Debt (Non-recourse Debt Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2017
Feb. 28, 2017
Debt Instrument [Line Items]          
Construction line of credit facility remaining borrowing capacity $ 1,800,000,000        
Other line of credit remaining borrowing capacity 1,700,000,000        
Loss on extinguishment of debt 68,000,000 $ 13,000,000 $ 182,000,000    
Restricted cash and debt service reserves 642,000,000 $ 535,000,000      
Restricted net assets 2,800,000,000        
Non-Recourse Debt          
Debt Instrument [Line Items]          
Debt face amount 3,508,000,000        
Repayments of long-term debt (2,550,000,000)        
Loss on extinguishment of debt 23,000,000        
Non-Recourse Debt | AES Tiete [Domain]          
Debt Instrument [Line Items]          
Debt face amount 585,000,000        
Repayments of long-term debt (293,000,000)        
Loss on extinguishment of debt (5,000,000)        
Non-Recourse Debt | Gener Subsidiary [Member]          
Debt Instrument [Line Items]          
Debt face amount 335,000,000        
Repayments of long-term debt (426,000,000)        
Loss on extinguishment of debt (20,000,000)        
Non-Recourse Debt | AES Argentina [Member]          
Debt Instrument [Line Items]          
Debt face amount 310,000,000       $ 75,000,000
Repayments of long-term debt (181,000,000)        
Loss on extinguishment of debt 65,000,000        
Non-Recourse Debt | IPALCO Enterprises, Inc. [Member]          
Debt Instrument [Line Items]          
Debt face amount 608,000,000        
Repayments of long-term debt (528,000,000)        
Loss on extinguishment of debt (9,000,000)        
Non-Recourse Debt | AES Southland [Domain]          
Debt Instrument [Line Items]          
Debt face amount 557,000,000     $ 1,967,000,000  
Repayments of long-term debt 0        
Loss on extinguishment of debt 0        
Non-Recourse Debt | DPL Subsidiary          
Debt Instrument [Line Items]          
Debt face amount 103,000,000        
Repayments of long-term debt (249,000,000)        
Loss on extinguishment of debt (3,000,000)        
Non-Recourse Debt | Masinloc Subsidiary [Member]          
Debt Instrument [Line Items]          
Debt face amount 160,000,000        
Repayments of long-term debt (51,000,000)        
Loss on extinguishment of debt 0        
Non-Recourse Debt | MCAC          
Debt Instrument [Line Items]          
Debt face amount 262,000,000        
Repayments of long-term debt 0        
Loss on extinguishment of debt 0        
Non-Recourse Debt | Los Mina [Member]          
Debt Instrument [Line Items]          
Debt face amount 303,000,000        
Repayments of long-term debt (275,000,000)        
Loss on extinguishment of debt (4,000,000)        
Non-Recourse Debt | Other Subsidiaries [Member]          
Debt Instrument [Line Items]          
Debt face amount 285,000,000        
Repayments of long-term debt (547,000,000)        
Loss on extinguishment of debt $ (1,000,000)