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Asset Retirement Obligation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation $ 920 $ 778 $ 757
Asset Retirement Obligation, Liabilities Incurred 61 40  
Asset Retirement Obligation, Liabilities Settled 30 14  
Asset Retirement Obligation, Accretion Expense 41 31  
Asset Retirement Obligation, Revision of Estimate 127 (35)  
Asset Retirement Obligations, Sale of Plants (58) 0  
Asset Retirement Obligation, Other 1 (1)  
IPL Subsidiary [Member]      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Oil and Gas, Cost Incurred, Asset Retirement Obligation 129 34  
AES Clean Energy      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Oil and Gas, Cost Incurred, Asset Retirement Obligation 73 43  
AES Southland [Domain]      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Oil and Gas, Cost Incurred, Asset Retirement Obligation 43 51  
AES Brasil      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Oil and Gas, Cost Incurred, Asset Retirement Obligation 15 20  
AES Indiana      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation, Accretion Expense $ 16 $ 13