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Debt (Non-recourse Debt Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]              
Loss on extinguishment of debt         $ 78 $ 186 $ 169
Restricted cash and debt service reserves         370 587  
Restricted net assets         1,500    
Finance Lease, Liability, Current         6 $ 4  
AES Panama              
Debt Instrument [Line Items]              
Loss on extinguishment of debt       $ 16      
Non-Recourse Debt | Brazil subsidiary [Member]              
Debt Instrument [Line Items]              
Repayments of long-term debt [1]         (382)    
Loss on extinguishment of debt [1]         27    
Proceeds from Issuance of Debt [1]         412    
Non-Recourse Debt | IPALCO Enterprises, Inc. [Member]              
Debt Instrument [Line Items]              
Repayments of long-term debt $ (95)            
Loss on extinguishment of debt 0            
Proceeds from Issuance of Debt 95            
Non-Recourse Debt | AES Clean Energy              
Debt Instrument [Line Items]              
Repayments of long-term debt         0    
Loss on extinguishment of debt         0    
Proceeds from Issuance of Debt         $ 502    
Non-Recourse Debt | AES Andres              
Debt Instrument [Line Items]              
Repayments of long-term debt   $ (274)          
Loss on extinguishment of debt   14          
Proceeds from Issuance of Debt   $ 300          
Non-Recourse Debt | ANDES [Member]              
Debt Instrument [Line Items]              
Repayments of long-term debt (129)            
Loss on extinguishment of debt 14            
Proceeds from Issuance of Debt $ 0            
Nonrecourse [Member] | DPL Subsidiary              
Debt Instrument [Line Items]              
Loss on extinguishment of debt     $ 34        
Nonrecourse [Member] | IPALCO Enterprises, Inc. [Member]              
Debt Instrument [Line Items]              
Loss on extinguishment of debt     2        
Nonrecourse [Member] | Colon [Domain]              
Debt Instrument [Line Items]              
Extinguishment of Debt, Amount       610      
Nonrecourse [Member] | Changuinola [Member]              
Debt Instrument [Line Items]              
Extinguishment of Debt, Amount       171      
Nonrecourse [Member] | AES Panama              
Debt Instrument [Line Items]              
Extinguishment of Debt, Amount       447      
4.375% senior notes due 2030 [Member] | Senior Notes [Member] | AES Panama              
Debt Instrument [Line Items]              
Debt face amount       $ 1,400      
Debt Instrument, Interest Rate, Stated Percentage       4.375%      
Panama Term Loan due 2023 [Member] | Non-Recourse Debt | AES Panama              
Debt Instrument [Line Items]              
Debt face amount       $ 105      
6.25% Senior Secured Facility Agreement due 2034 [Member] | Senior Notes [Member] | Cochrane Subsidiary              
Debt Instrument [Line Items]              
Debt face amount       $ 485      
Debt Instrument, Interest Rate, Stated Percentage       6.25%      
7.25% Senior Notes due 2021 [Domain] | DPL Subsidiary              
Debt Instrument [Line Items]              
Extinguishment of Debt, Amount     $ 380        
7.25% Senior Notes due 2021 [Domain] | Unsecured Debt [Member] | DPL Subsidiary              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage     7.25%        
4.125% senior secured notes due 2025 [Member] | Senior Notes [Member] | DPL Subsidiary              
Debt Instrument [Line Items]              
Debt face amount     $ 415        
Debt Instrument, Interest Rate, Stated Percentage     4.125%        
4.25% senior secured notes due 2030 [Member] | Senior Notes [Member] | IPALCO Enterprises, Inc. [Member]              
Debt Instrument [Line Items]              
Debt face amount     $ 475        
Debt Instrument, Interest Rate, Stated Percentage     4.25%        
3.45% senior unsecured notes due 2020 [Member] | IPALCO Enterprises, Inc. [Member]              
Debt Instrument [Line Items]              
Extinguishment of Debt, Amount     $ 405        
3.45% senior unsecured notes due 2020 [Member] | Unsecured Debt [Member] | IPALCO Enterprises, Inc. [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage     3.45%        
IPALCO term loan due 2020 [Member] | Non-Recourse Debt | IPALCO Enterprises, Inc. [Member]              
Debt Instrument [Line Items]              
Extinguishment of Debt, Amount     $ 65        
Senior Notes [Member] | Cochrane Subsidiary              
Debt Instrument [Line Items]              
Extinguishment of Debt, Amount       $ 445      
[1] Repayments relate to Andres and DPP.