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Asset Impairment Expense (Impairment of Long-Lived Assets Held and Used by Asset) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Asset Impairment Expense [Line Items]            
Asset impairment expense $ (849) $ (69) $ (116) $ (864) $ (185) $ (208)
Impairment of Long-Lived Assets Held-for-use       864 185 208
Kilroot and Ballylumford [Member]            
Asset Impairment Expense [Line Items]            
Impairment of Long-Lived Assets Held-for-use       0 115 0
Hawaii Subsidiary [Member]            
Asset Impairment Expense [Line Items]            
Impairment of Long-Lived Assets Held-for-use 38     38 60 0
Shady Point [Member]            
Asset Impairment Expense [Line Items]            
Impairment of Long-Lived Assets Held-for-use       0 0 157
Nejapa [Member]            
Asset Impairment Expense [Line Items]            
Impairment of Long-Lived Assets Held-for-use       0 0 37
Other            
Asset Impairment Expense [Line Items]            
Impairment of Long-Lived Assets Held-for-use       15 10 14
AES Gener            
Asset Impairment Expense [Line Items]            
Impairment of Long-Lived Assets Held-for-use $ 781     781   0
AES Panama            
Asset Impairment Expense [Line Items]            
Impairment of Long-Lived Assets Held-for-use       $ 30 $ 0 $ 0