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Debt - Non-Recourse Debt Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Debt Instrument [Line Items]          
Debt defaults at risk of causing cross default   0   0  
Loss on extinguishment of debt   $ (40) $ (51) $ (41) $ (61)
Proceeds From Issuance Of Nonrecourse Debt       1,913 2,581
IPALCO Enterprises, Inc. [Member]          
Debt Instrument [Line Items]          
Loss on extinguishment of debt       (2)  
Nonrecourse Debt [Member] | IPALCO Enterprises, Inc. [Member]          
Debt Instrument [Line Items]          
Proceeds From Issuance Of Nonrecourse Debt       475  
Repayments of Long-term Debt       (470)  
Nonrecourse Debt [Member] | AES Southland [Domain]          
Debt Instrument [Line Items]          
Proceeds From Issuance Of Nonrecourse Debt [1]       283  
Repayments of Long-term Debt       0  
Nonrecourse Debt [Member] | AES Tiete [Domain]          
Debt Instrument [Line Items]          
Proceeds From Issuance Of Nonrecourse Debt       95  
Repayments of Long-term Debt       (1)  
Nonrecourse Debt [Member] | DPL Subsidiary [Member]          
Debt Instrument [Line Items]          
Proceeds From Issuance Of Nonrecourse Debt       415  
Repayments of Long-term Debt       0  
Nonrecourse Debt [Member] | Gener Subsidiary [Member]          
Debt Instrument [Line Items]          
Proceeds From Issuance Of Nonrecourse Debt       90  
Repayments of Long-term Debt       (8)  
Nonrecourse Debt [Member] | Mong Duong Subsidiary [Member]          
Debt Instrument [Line Items]          
Proceeds From Issuance Of Nonrecourse Debt       150  
Repayments of Long-term Debt       $ 0  
3.95% Senior Notes due 2049 [Domain] | Senior Notes [Member] | DP&L [Member]          
Debt Instrument [Line Items]          
Issued new debt     $ 425   $ 425
Debt Instrument, Interest Rate, Stated Percentage     3.95%   3.95%
Variable Rate [Domain] | Senior Notes [Member] | DP&L [Member]          
Debt Instrument [Line Items]          
Issued new debt     $ 445   $ 445
Extinguishment of Debt, Amount         435
4.35% Senior Notes due 2029 [Domain] | Senior Notes [Member] | DPL Subsidiary [Member]          
Debt Instrument [Line Items]          
Loss on extinguishment of debt         (43)
Issued new debt     $ 400   $ 400
Debt Instrument, Interest Rate, Stated Percentage     4.35%   4.35%
7.25% Senior Notes due 2021 [Domain] | Senior Notes [Member] | DPL Subsidiary [Member]          
Debt Instrument [Line Items]          
Issued new debt     $ 780   $ 780
Debt Instrument, Interest Rate, Stated Percentage   7.25% 7.25% 7.25% 7.25%
Extinguishment of Debt, Amount         $ 400
4.125% Senior Notes due 2025 [Domain] | Senior Notes [Member] | DPL Subsidiary [Member]          
Debt Instrument [Line Items]          
Issued new debt   $ 415   $ 415  
Debt Instrument, Interest Rate, Stated Percentage   4.125%   4.125%  
4.25% Senior Notes due 2030 [Domain] | Senior Notes [Member] | IPALCO Enterprises, Inc. [Member]          
Debt Instrument [Line Items]          
Issued new debt   $ 475   $ 475  
Debt Instrument, Interest Rate, Stated Percentage   4.25%   4.25%  
3.45% Senior Notes due 2020 [Domain] | Senior Notes [Member] | IPALCO Enterprises, Inc. [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage   3.45%   3.45%  
Extinguishment of Debt, Amount       $ 405  
65 Million Term Loan due 2020 [Domain] | Senior Notes [Member] | IPALCO Enterprises, Inc. [Member]          
Debt Instrument [Line Items]          
Extinguishment of Debt, Amount       $ 65  
London Interbank Offered Rate (LIBOR) [Member] | LIBOR 1.75% Term Loan Due In 2022 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate       1.75%  
London Interbank Offered Rate (LIBOR) [Member] | LIBOR 2.25% Senior Notes Due In 2029 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate       2.25%  
London Interbank Offered Rate (LIBOR) [Member] | LIBOR 4.15% Senior Notes Due In 2029 [Member] [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate       4.15%  
Corporate and Other [Member]          
Debt Instrument [Line Items]          
Loss on extinguishment of debt       $ (37)  
Corporate and Other [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Extinguishment of Debt, Amount   $ 350      
Corporate and Other [Member] | 4.0% Senior Notes Due 2021 [Domain] [Domain] | Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage   4.00%   4.00%  
Subsequent Event [Member] | 7.25% Senior Notes due 2021 [Domain] | Senior Notes [Member] | DPL Subsidiary [Member]          
Debt Instrument [Line Items]          
Extinguishment of Debt, Amount $ 380        
[1]
Issuances relate to the June 2017 long-term non-recourse debt financing to fund the Southland repowering construction projects.