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Asset Impairment Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Apr. 12, 2019
Asset Impairment Expense [Line Items]          
Impairment of Long-Lived Assets Held-for-use $ 849 $ 0 $ 855 $ 116  
AES Gener          
Asset Impairment Expense [Line Items]          
Impairment of Long-Lived Assets Held-for-use 781 0 781 0  
AES Hawaii          
Asset Impairment Expense [Line Items]          
Impairment of Long-Lived Assets Held-for-use 38 0 38 0  
AES Panama          
Asset Impairment Expense [Line Items]          
Impairment of Long-Lived Assets Held-for-use 30 0 30 0  
Kilroot and Ballylumford [Member]          
Asset Impairment Expense [Line Items]          
Impairment of Long-Lived Assets Held-for-use 0 0 0 115  
Assets Carrying Amount Disclosure Nonrecurring   114   114  
Kilroot and Ballylumford [Member] | Long Lived Assets Held And Used [Member]          
Asset Impairment Expense [Line Items]          
Assets Carrying Amount Disclosure Nonrecurring [1]         $ 232
Other Subsidiaries [Member]          
Asset Impairment Expense [Line Items]          
Impairment of Long-Lived Assets Held-for-use $ 0 $ 0 $ 6 $ 1  
[1] Represents the carrying values at the dates of measurement, before fair value adjustment.