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Debt - Non-Recourse Debt Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended
Feb. 28, 2017
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Debt defaults at risk of causing cross default   0  
Loss on extinguishment of debt   $ 170 $ (17)
Proceeds from Issuance of Debt $ 75    
Nonrecourse Debt [Member]      
Debt Instrument [Line Items]      
Loss on extinguishment of debt   0  
Issued new debt   579  
Repayments of Long-term Debt   (231)  
Nonrecourse Debt [Member] | AES Southland [Domain]      
Debt Instrument [Line Items]      
Loss on extinguishment of debt   0  
Issued new debt   194  
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  
Repayments of Long-term Debt   $ (231)  
Nonrecourse Debt [Member] | Andes - Generation [Member]      
Debt Instrument [Line Items]      
Loss on extinguishment of debt     (65)
7.75% Senior Notes Due 2024 [Member] | Nonrecourse Debt [Member] | Andes - Generation [Member]      
Debt Instrument [Line Items]      
Issued new debt     $ 300