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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
Dec. 31, 2019
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2019
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]                
Finance Lease, Liability, Current $ 3         $ 3    
Materiality threshold for cash distribution from business to Parent 20.00%         20.00%    
Construction line of credit facility remaining borrowing capacity $ 470         $ 470    
Other line of credit remaining borrowing capacity 1,100         1,100    
Loss on extinguishment of debt           169 $ 188 $ 68
Restricted cash and debt service reserves 372         372 $ 627  
Restricted net assets 1,200         1,200    
Finance Lease, Liability, Noncurrent 67         67    
Non-Recourse Debt | Gener Subsidiary [Member]                
Debt Instrument [Line Items]                
Debt face amount 1,000         1,000    
Repayments of long-term debt           (697)    
Loss on extinguishment of debt           29    
Non-Recourse Debt | AES Southland [Domain]                
Debt Instrument [Line Items]                
Debt face amount [1] 930         930    
Repayments of long-term debt           (210)    
Loss on extinguishment of debt           1    
Non-Recourse Debt | DPL Subsidiary                
Debt Instrument [Line Items]                
Debt face amount [2]       $ 825        
Repayments of long-term debt [2]       (835)        
Loss on extinguishment of debt [2]       43        
Non-Recourse Debt | AES Tiete [Domain]                
Debt Instrument [Line Items]                
Debt face amount       561        
Repayments of long-term debt       (533)        
Loss on extinguishment of debt       3        
Non-Recourse Debt | Cochrane Subsidiary                
Debt Instrument [Line Items]                
Debt face amount 875         875    
Repayments of long-term debt           (833)    
Loss on extinguishment of debt           24    
Non-Recourse Debt | TEGTEP Mexico Subsidiary [Member]                
Debt Instrument [Line Items]                
Debt face amount 280         280    
Repayments of long-term debt           (248)    
Loss on extinguishment of debt           1    
Non-Recourse Debt | Mong Duong Subsidiary [Member]                
Debt Instrument [Line Items]                
Debt face amount [3]         $ 1,120      
Repayments of long-term debt [3]         (1,081)      
Loss on extinguishment of debt [3]         31      
Non-Recourse Debt | Colon [Domain]                
Debt Instrument [Line Items]                
Debt face amount         610      
Repayments of long-term debt         (579)      
Loss on extinguishment of debt         28      
3.95% Senior Notes due 2049 [Domain] | Senior Notes [Member] | DP&L [Member]                
Debt Instrument [Line Items]                
Debt face amount       $ 425        
Debt Instrument, Interest Rate, Stated Percentage       3.95%        
LIBOR 2.25% Senior Notes Due In 2029 [Member] | Senior Notes [Member] | Mong Duong Subsidiary [Member]                
Debt Instrument [Line Items]                
Debt face amount         $ 1,100      
5.125% Senior Notes Due 2027 [Member] | Senior Notes [Member] | Cochrane Subsidiary                
Debt Instrument [Line Items]                
Debt face amount $ 430         $ 430    
Debt Instrument, Interest Rate, Stated Percentage 5.50%         5.50%    
6.25% Senior Secured Facility Agreement due 2034 [Member] | Credit Facility [Domain] | Cochrane Subsidiary                
Debt Instrument [Line Items]                
Debt face amount $ 445         $ 445    
Debt Instrument, Interest Rate, Stated Percentage 6.25%         6.25%    
8.0% Senior Notes Due 2020 [Domain]                
Debt Instrument [Line Items]                
Extinguishment of Debt, Amount     $ 228          
8.0% Senior Notes Due 2020 [Domain] | Unsecured Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage     8.00%          
4.5% Senior Notes Due 2023 [Domain] [Domain] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt face amount     $ 500          
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          
4.0% Senior Notes Due 2021 [Domain] [Domain] | Unsecured Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage     4.00%          
4.41% SPV Loan [Member] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage         4.41%      
7.18% SPV Loan [Member] [Member] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage         7.18%      
LIBOR 4.15% Senior Notes Due In 2029 [Member] [Member] | Senior Notes [Member] | Non-Recourse Debt | Mong Duong Subsidiary [Member]                
Debt Instrument [Line Items]                
Loss on extinguishment of debt         $ 31      
Variable Rate [Domain] | Cochrane Subsidiary                
Debt Instrument [Line Items]                
Extinguishment of Debt, Amount           $ 833    
Variable Rate [Domain] | DP&L [Member]                
Debt Instrument [Line Items]                
Extinguishment of Debt, Amount       $ 435        
Variable Rate [Domain] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt face amount       445        
Variable Rate [Domain] | Senior Notes [Member] | Gener Subsidiary [Member]                
Debt Instrument [Line Items]                
Loss on extinguishment of debt           (29)    
Variable Rate [Domain] | Senior Notes [Member] | Cochrane Subsidiary                
Debt Instrument [Line Items]                
Loss on extinguishment of debt           (24)    
7.125% Senior Unsecured Notes due 2079 [Member] | Senior Notes [Member] | Gener Subsidiary [Member]                
Debt Instrument [Line Items]                
Debt face amount   $ 550            
Debt Instrument, Interest Rate, Stated Percentage   7.125%            
8.35% Senior Unsecured Notes due 2073 [Member] | Gener Subsidiary [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage   8.375%            
Extinguishment of Debt, Amount   $ 450            
6.35% Senior Unsecured Notes due 2079 [Member] | Senior Notes [Member] | Gener Subsidiary [Member]                
Debt Instrument [Line Items]                
Debt face amount $ 450         $ 450    
Debt Instrument, Interest Rate, Stated Percentage 6.35%         6.35%    
Senior unsecured notes due 2021 [Member] | Gener Subsidiary [Member]                
Debt Instrument [Line Items]                
Extinguishment of Debt, Amount $ 73         $ 119    
Senior unsecured notes due 2025 [Member] | Gener Subsidiary [Member]                
Debt Instrument [Line Items]                
Extinguishment of Debt, Amount $ 55              
4.35% Senior Notes due 2029 [Domain] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt face amount       $ 400        
Debt Instrument, Interest Rate, Stated Percentage       4.35%        
7.25% Senior Notes due 2021 [Domain]                
Debt Instrument [Line Items]                
Extinguishment of Debt, Amount       $ 400        
7.25% Senior Notes due 2021 [Domain] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt face amount       $ 780        
7.25% Senior Notes due 2021 [Domain] | Unsecured Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage       7.25%        
7.25% Senior Notes due 2021 [Domain] | Unsecured Debt [Member] | Non-Recourse Debt                
Debt Instrument [Line Items]                
Loss on extinguishment of debt       $ 43        
[1]
Issuances relate to the June 2017 long-term non-recourse debt financing to fund the Southland re-powering construction projects, a non-recourse bridge loan in September 2019, and long-term non-recourse debt financing issued in December 2019 to settle the bridge loan.
[2]
Includes transactions at DPL and its subsidiary, DP&L.
[3]
Non-cash transaction via an equity affiliate. See below for further information.