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Equity Reclassifications Out of AOCL (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]      
Cost of Product and Service Sold $ (2,485)   $ (2,466)
General and Administrative Expense (77)   (75)
Other expense (52)   (38)
Interest expense (342) $ (357) (357)
Gain (loss) on disposal and sale of business interests (1)   43
Impairment expense (49)   (46)
Foreign currency transaction gains (losses) (10)   (8)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES (22)   277
Income tax benefit (expense) (17)   16
Income (Loss) from Equity Method Investments (34)   (15)
Net income (loss) (73)   278
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION 46   432
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (15)    
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]      
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0    
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]      
Cost of Product and Service Sold 1   (1)
Interest expense 16   1
Foreign currency transaction gains (losses) 3   1
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES 20   1
Income tax benefit (expense) (6)   0
Income (Loss) from Equity Method Investments 0   1
INCOME FROM CONTINUING OPERATIONS 14   2
Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]      
Less: Net loss attributable to noncontrolling interests and redeemable stock of subsidiaries 1   0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0    
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent      
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (15)    
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]      
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION $ 15   $ 2