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Asset Impairment Expense (Tables)
12 Months Ended
Dec. 31, 2020
Impairment or Disposal of Tangible Assets Disclosure [Abstract]  
Details of Impairment of Long-Lived Assets Held and Used by Asset
Year ended December 31, (in millions)202020192018
AES Gener$781 $— $— 
Hawaii38 60 — 
Estrella del Mar I30 — — 
Kilroot and Ballylumford— 115 — 
Shady Point— — 157 
Nejapa— — 37 
Other15 10 14 
Total$864 $185 $208