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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, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]                        
Loss on extinguishment of debt                   $ 186 $ 169 $ 188
Restricted cash and debt service reserves     $ 372             587 372  
Restricted net assets                   1,700    
Finance Lease, Liability, Current     3             4 3  
AES Panama                        
Debt Instrument [Line Items]                        
Loss on extinguishment of debt                 $ 16      
Non-Recourse Debt | AES Southland [Domain]                        
Debt Instrument [Line Items]                        
Debt face amount [1]                   283    
Repayments of long-term debt                   (125)    
Loss on extinguishment of debt                   1    
Non-Recourse Debt | Brazil subsidiary [Member]                        
Debt Instrument [Line Items]                        
Debt face amount [2]                   375    
Repayments of long-term debt [2]                   (1)    
Loss on extinguishment of debt [2]                   $ 0    
Non-Recourse Debt | Gener Subsidiary [Member]                        
Debt Instrument [Line Items]                        
Debt face amount   $ 90         $ 90          
Repayments of long-term debt             (8)          
Loss on extinguishment of debt             0          
Non-Recourse Debt | DPL Subsidiary                        
Debt Instrument [Line Items]                        
Debt face amount $ 555               555      
Repayments of long-term debt                 (520)      
Loss on extinguishment of debt                 34      
Non-Recourse Debt | IPALCO Enterprises, Inc. [Member]                        
Debt Instrument [Line Items]                        
Debt face amount   475         475          
Repayments of long-term debt   (470)                    
Loss on extinguishment of debt             2          
Non-Recourse Debt | Mong Duong Subsidiary [Member]                        
Debt Instrument [Line Items]                        
Debt face amount   150         150          
Repayments of long-term debt   $ 0                    
Loss on extinguishment of debt             0          
Non-Recourse Debt | Cochrane Subsidiary                        
Debt Instrument [Line Items]                        
Debt face amount [3] 485               485      
Repayments of long-term debt [3] (445)                      
Loss on extinguishment of debt [3]                 1      
Non-Recourse Debt | Angamos [Member]                        
Debt Instrument [Line Items]                        
Debt face amount 0               0      
Repayments of long-term debt (309)                      
Loss on extinguishment of debt                 5      
Non-Recourse Debt | AES Panama                        
Debt Instrument [Line Items]                        
Debt face amount 1,485               1,485      
Repayments of long-term debt (1,228)                      
Loss on extinguishment of debt                 16      
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               $ 1,400      
Debt Instrument, Interest Rate, Stated Percentage 4.375%               4.375%      
Panama Term Loan due 2023 [Member] | Non-Recourse Debt | AES Panama                        
Debt Instrument [Line Items]                        
Debt face amount $ 105               $ 105      
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%  
6.25% Senior Secured Facility Agreement due 2034 [Member] | Senior Notes [Member] | Cochrane Subsidiary                        
Debt Instrument [Line Items]                        
Debt face amount $ 485               $ 485      
Debt Instrument, Interest Rate, Stated Percentage 6.25%               6.25%      
4.35% Senior Notes due 2029 [Domain] | Senior Notes [Member] | DPL Subsidiary                        
Debt Instrument [Line Items]                        
Debt face amount         $ 400     $ 400        
Debt Instrument, Interest Rate, Stated Percentage         4.35%     4.35%        
7.25% Senior Notes due 2021 [Domain] | DPL Subsidiary                        
Debt Instrument [Line Items]                        
Extinguishment of Debt, Amount             $ 380 $ 400        
7.25% Senior Notes due 2021 [Domain] | Senior Notes [Member] | DPL Subsidiary                        
Debt Instrument [Line Items]                        
Debt face amount         $ 780     $ 780        
7.25% Senior Notes due 2021 [Domain] | Unsecured Debt [Member] | DPL Subsidiary                        
Debt Instrument [Line Items]                        
Debt Instrument, Interest Rate, Stated Percentage   7.25%     7.25%   7.25% 7.25%        
7.25% Senior Notes due 2021 [Domain] | Unsecured Debt [Member] | Non-Recourse Debt | DPL Subsidiary                        
Debt Instrument [Line Items]                        
Loss on extinguishment of debt               $ 43        
4.125% senior secured notes due 2025 [Member] | Senior Notes [Member] | DPL Subsidiary                        
Debt Instrument [Line Items]                        
Debt face amount   $ 415         $ 415          
Debt Instrument, Interest Rate, Stated Percentage   4.125%         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         $ 475          
Debt Instrument, Interest Rate, Stated Percentage   4.25%         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%         3.45%          
IPALCO term loan due 2020 [Member] | Non-Recourse Debt | IPALCO Enterprises, Inc. [Member]                        
Debt Instrument [Line Items]                        
Extinguishment of Debt, Amount             $ 65          
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                  
LIBOR 4.15% Senior Notes Due In 2029 [Member] [Member] | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate       4.15%                
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                
LIBOR 2.25% Senior Notes Due In 2029 [Member] | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate       2.25%                
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                
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%                
3.95% Senior Notes due 2049 [Domain] | Senior Notes [Member] | DPL Subsidiary                        
Debt Instrument [Line Items]                        
Debt face amount         $ 425     $ 425        
Debt Instrument, Interest Rate, Stated Percentage         3.95%     3.95%        
Senior Notes [Member] | Cochrane Subsidiary                        
Debt Instrument [Line Items]                        
Extinguishment of Debt, Amount                 $ 445      
Variable Rate Debt | DPL Subsidiary                        
Debt Instrument [Line Items]                        
Extinguishment of Debt, Amount         $ 435              
Variable Rate Debt | Cochrane Subsidiary                        
Debt Instrument [Line Items]                        
Extinguishment of Debt, Amount                     833  
Variable Rate Debt | Senior Notes [Member]                        
Debt Instrument [Line Items]                        
Debt face amount         $ 445     $ 445        
Variable Rate Debt | Senior Notes [Member] | Gener Subsidiary [Member]                        
Debt Instrument [Line Items]                        
Loss on extinguishment of debt     $ (29)                  
Variable Rate Debt | Senior Notes [Member] | Cochrane Subsidiary                        
Debt Instrument [Line Items]                        
Loss on extinguishment of debt                     $ (24)  
[1] Issuances relate to the June 2017 long-term non-recourse debt financing to fund the Southland repowering construction projects.
[2] Includes transactions at DPL and its subsidiary, DP&L.
[3] Repayments relate to existing obligations at AES Panama, Changuinola, and Colon.