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Debt - Non-Recourse Debt Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Debt Instrument [Line Items]          
Debt defaults at risk of causing cross default   0   0  
Loss on extinguishment of debt   $ 6 $ 12 $ 176 $ (5)
Proceeds from Issuance of Debt $ 75        
Nonrecourse Debt [Member]          
Debt Instrument [Line Items]          
Loss on extinguishment of debt       (6)  
Issued new debt   891   891  
Repayments of Long-term Debt       (337)  
Nonrecourse Debt [Member] | AES Southland [Domain]          
Debt Instrument [Line Items]          
Loss on extinguishment of debt       0  
Issued new debt   402   402  
Repayments of Long-term Debt       0  
Nonrecourse Debt [Member] | AES Tiete [Domain]          
Debt Instrument [Line Items]          
Loss on extinguishment of debt       0  
Issued new debt   385   385  
Repayments of Long-term Debt       (231)  
Nonrecourse Debt [Member] | Alto Maipo [Member]          
Debt Instrument [Line Items]          
Loss on extinguishment of debt       0  
Issued new debt   104   104  
Repayments of Long-term Debt       0  
Nonrecourse Debt [Member] | Andes - Generation [Member]          
Debt Instrument [Line Items]          
Loss on extinguishment of debt     (65)    
Nonrecourse Debt [Member] | DPL Subsidiary [Member]          
Debt Instrument [Line Items]          
Loss on extinguishment of debt       (6)  
Issued new debt   $ 0   0  
Repayments of Long-term Debt       $ (106)  
7.75% Senior Notes Due 2024 [Member] | Nonrecourse Debt [Member] | Andes - Generation [Member]          
Debt Instrument [Line Items]          
Issued new debt     $ 300   $ 300