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Asset Impairment Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Asset Impairment Expense [Line Items]      
Impairment of Long-Lived Assets Held-for-use $ 49   $ 46
Other Asset Impairment Charges 49   46
Impairment expense $ 49   $ 46
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Jordan (IPP1 & IPP4)      
Asset Impairment Expense [Line Items]      
Disposal Group Not Discontinued Operation Ownership Interest Sold 26.00%   26.00%
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Mong Duong held-for-sale      
Asset Impairment Expense [Line Items]      
Assets Carrying Amount Disclosure Nonrecurring $ 367    
Disposal Group Not Discontinued Operation Ownership Interest Sold 51.00%    
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Mong Duong Financing SPV      
Asset Impairment Expense [Line Items]      
Disposal Group Not Discontinued Operation Ownership Interest Sold 51.00%    
Other Subsidiaries [Member]      
Asset Impairment Expense [Line Items]      
Impairment of Long-Lived Assets Held-for-use $ 1   $ 2
AES Clean Energy Development      
Asset Impairment Expense [Line Items]      
Impairment of Long-Lived Assets to be Disposed of 31   7
Impairment expense 31   7
Mong Duong held-for-sale      
Asset Impairment Expense [Line Items]      
Impairment of Long-Lived Assets to be Disposed of $ 17   37
Mong Duong held-for-sale | Long Lived Assets Held And Used [Member] | Estimate of Fair Value Measurement [Member]      
Asset Impairment Expense [Line Items]      
Assets Carrying Amount Disclosure Nonrecurring   $ 383 450
Mong Duong held-for-sale | Long Lived Assets Held And Used [Member]      
Asset Impairment Expense [Line Items]      
Other Asset Impairment Charges   17 37
Mong Duong held-for-sale | Long Lived Assets Held And Used [Member] | Level 3 [Member] | Estimate of Fair Value Measurement [Member]      
Asset Impairment Expense [Line Items]      
Assets Carrying Amount Disclosure Nonrecurring   $ 0 $ 0