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Debt - Non-Recourse Debt Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Debt Instrument [Line Items]    
Proceeds From Issuance Of Nonrecourse Debt $ 1,710 $ 307
Loss on extinguishment of debt (6) $ (1)
Nonrecourse Debt [Member] | JPMORGAN CHASE BANK N.A. LONDON BRANCH    
Debt Instrument [Line Items]    
Proceeds From Issuance Of Nonrecourse Debt 500  
AES Brasil [Domain] | Nonrecourse Debt [Member]    
Debt Instrument [Line Items]    
Proceeds From Issuance Of Nonrecourse Debt 219  
Repayments of Long-term Debt (192)  
AES Gener | Nonrecourse Debt [Member]    
Debt Instrument [Line Items]    
Proceeds From Issuance Of Nonrecourse Debt 175  
Repayments of Long-term Debt (95)  
Colon [Domain] | Nonrecourse Debt [Member] | JPMORGAN CHASE BANK N.A. LONDON BRANCH    
Debt Instrument [Line Items]    
Proceeds From Issuance Of Nonrecourse Debt 50  
AES Hispanola Holdings BV | Nonrecourse Debt [Member]    
Debt Instrument [Line Items]    
Repayments of Long-term Debt 0  
AES Hispanola Holdings BV | Nonrecourse Debt [Member] | JPMORGAN CHASE BANK N.A. LONDON BRANCH    
Debt Instrument [Line Items]    
Proceeds From Issuance Of Nonrecourse Debt 450  
Mercury Chile HoldCo LLC    
Debt Instrument [Line Items]    
Proceeds from Contributed Capital 196  
Mercury Chile HoldCo LLC | Bridge Loan    
Debt Instrument [Line Items]    
Repayments of Short-Term Debt 350  
Mercury Chile HoldCo LLC | Bridge Loan | JPMORGAN CHASE BANK N.A. LONDON BRANCH    
Debt Instrument [Line Items]    
Issued senior notes 500  
Mercury Chile HoldCo LLC | Nonrecourse Debt [Member]    
Debt Instrument [Line Items]    
Proceeds From Issuance Of Nonrecourse Debt 710  
Mercury Chile HoldCo LLC | Nonrecourse Debt [Member] | Bridge Loan    
Debt Instrument [Line Items]    
Proceeds From Issuance Of Nonrecourse Debt 350  
Mercury Chile HoldCo LLC | Senior Notes [Member] | 6.5% senior notes due 2027    
Debt Instrument [Line Items]    
Issued senior notes $ 360  
Debt Instrument, Interest Rate, Stated Percentage 6.50%