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Debt (Non-Recourse Debt Maturity Schedule) (Details) - USD ($)
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Debt Details [Line Items]      
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ (394,000,000)   $ (425,000,000)
Non Recourse Debt Total 15,340,000,000   $ 14,783,000,000
Nonrecourse Debt [Member]      
Debt Details [Line Items]      
Debt Instrument, Face Amount 3,508,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Two 796,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,396,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Four 1,833,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Five 1,768,000,000    
Long-term Debt, Maturities, Repayments of Principal after Year Five 7,696,000,000    
Nonrecourse Debt [Member]      
Debt Details [Line Items]      
Non-Recourse Debt 2,245,000,000    
AES Southland [Domain] | Nonrecourse Debt [Member]      
Debt Details [Line Items]      
Debt Instrument, Face Amount $ 557,000,000 $ 1,967,000,000