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Debt (Non-recourse Debt Narrative) (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 01, 2017
Feb. 28, 2017
Debt Instrument [Line Items]            
Materiality threshold for cash distribution from business to Parent   20.00%        
Construction line of credit facility remaining borrowing capacity   $ 811,000,000        
Other line of credit remaining borrowing capacity   1,800,000,000        
Loss on extinguishment of debt   188,000,000 $ 68,000,000 $ 13,000,000    
Restricted cash and debt service reserves   627,000,000 642,000,000      
Restricted net assets   2,900,000,000        
Non-Recourse Debt            
Debt Instrument [Line Items]            
Debt face amount   1,351,000,000        
Repayments of long-term debt   (628,000,000)        
Loss on extinguishment of debt   (13,000,000)        
Non-Recourse Debt | AES Tiete [Domain]            
Debt Instrument [Line Items]            
Debt face amount   385,000,000        
Repayments of long-term debt   (231,000,000)        
Loss on extinguishment of debt   0        
Non-Recourse Debt | Gener Subsidiary [Member]            
Debt Instrument [Line Items]            
Debt face amount   0        
Repayments of long-term debt   (106,000,000)        
Loss on extinguishment of debt   6,000,000        
Non-Recourse Debt | AES Argentina [Member]            
Debt Instrument [Line Items]            
Debt face amount   0       $ 75,000,000
Repayments of long-term debt   (104,000,000)        
Loss on extinguishment of debt   7,000,000        
Non-Recourse Debt | IPALCO Enterprises, Inc. [Member]            
Debt Instrument [Line Items]            
Debt face amount [1]   757,000,000        
Repayments of long-term debt   0        
Loss on extinguishment of debt   0        
Non-Recourse Debt | AES Southland [Domain]            
Debt Instrument [Line Items]            
Debt face amount   104,000,000        
Repayments of long-term debt   0        
Loss on extinguishment of debt   0        
Non-Recourse Debt | MCAC            
Debt Instrument [Line Items]            
Debt face amount   105,000,000        
Repayments of long-term debt   (89,000,000)        
Loss on extinguishment of debt   0        
Non-Recourse Debt | Los Mina [Member]            
Debt Instrument [Line Items]            
Debt face amount   0        
Repayments of long-term debt   (98,000,000)        
Loss on extinguishment of debt   $ 0        
Unsecured Debt [Member] | AES Argentina [Member]            
Debt Instrument [Line Items]            
Loss on extinguishment of debt     $ (65,000,000)      
5.125% Senior Notes Due 2017 [Member] | Senior Notes [Member]            
Debt Instrument [Line Items]            
Debt face amount $ 500,000,000          
5.125% Senior Notes Due 2027 [Member] | Unsecured Debt [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage         5.125%  
8.0% Senior Notes Due 2020 [Domain] | Unsecured Debt [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage 8.00% 8.00%     8.00%  
Loss on extinguishment of debt $ 47,000,000          
4.5% Senior Notes Due 2023 [Domain] [Domain] | Senior Notes [Member]            
Debt Instrument [Line Items]            
Debt face amount   $ 500,000,000        
4.5% Senior Notes Due 2023 [Domain] [Domain] | Unsecured Debt [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage   4.50%        
4.0% Senior Notes Due 2021 [Domain] [Domain] | Senior Notes [Member]            
Debt Instrument [Line Items]            
Debt face amount   $ 500,000,000        
4.0% Senior Notes Due 2021 [Domain] [Domain] | Unsecured Debt [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage   4.00%        
[1] Issuances relate to the June 2017, long-term non-recourse debt financing to fund the Southland re-powering construction projects.