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Equity Equity Transactions with Noncontrolling Interests (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2025
Sep. 30, 2024
May 13, 2025
Dec. 31, 2024
Noncontrolling Interest [Line Items]                      
Contributions from noncontrolling interests               $ 337,000,000 $ 137,000,000    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 8,408,000,000             8,408,000,000     $ 7,704,000,000
Payments to Noncontrolling Interests               523,000,000 165,000,000    
NET INCOME ATTRIBUTABLE TO THE AES CORPORATION $ 639,000,000     $ 504,000,000       590,000,000 1,212,000,000    
Net transfers (to) from noncontrolling interest               (70,000,000) (13,000,000)    
Change from net income attributable to The AES Corporation and transfers (to) from noncontrolling interests               520,000,000 1,199,000,000    
Acquisitions of Noncontrolling Interests               143,000,000 0    
Energy Infrastructure                      
Noncontrolling Interest [Line Items]                      
Noncontrolling Interest, Ownership Percentage by Parent                   96.70%  
Cochrane Subsidiary [Member]                      
Noncontrolling Interest [Line Items]                      
Stockholders' Equity, Period Increase (Decrease)               40,000,000      
Adjustments to Additional Paid in Capital, Other               (23,000,000)      
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent               (17,000,000)      
Ownership interest acquired in subsidiary                   40.00%  
Acquisitions of Noncontrolling Interests               $ 89,000,000      
Chile Renovables SpA                      
Noncontrolling Interest [Line Items]                      
Sale of Stock, Consideration Received on Transaction     $ 14,000,000     $ 40,000,000          
Adjustments to Additional Paid in Capital, Other     (3,000,000)     (11,000,000)          
Noncontrolling Interest, Increase from Subsidiary Equity Issuance           51,000,000          
Noncontrolling Interest, Change in Redemption Value     17,000,000                
Proceeds from Issuance or Sale of Equity             $ 275,000,000        
Chile Renovables SpA | Global Infrastructure Management                      
Noncontrolling Interest [Line Items]                      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 49.00%             49.00%      
AES Puerto Rico Solar                      
Noncontrolling Interest [Line Items]                      
Sale of Stock, Consideration Received on Transaction                 $ 35,000,000    
Sale of Stock, Percentage of Ownership before Transaction                 30.00%    
IPL Subsidiary [Member]                      
Noncontrolling Interest [Line Items]                      
Noncontrolling Interest, Increase from Subsidiary Equity Issuance         $ 47,000,000 79,000,000          
AES Indiana                      
Noncontrolling Interest [Line Items]                      
Noncontrolling Interest, Increase from Subsidiary Equity Issuance               $ 150,000,000      
AES Clean Energy Subsidiary                      
Noncontrolling Interest [Line Items]                      
Adjustments to Additional Paid in Capital, Other $ (42,000,000)                    
Noncontrolling Interest, Increase from Subsidiary Equity Issuance               434,000,000 $ 599,000,000    
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests 28,000,000                    
Additional Paid-in Capital [Member]                      
Noncontrolling Interest [Line Items]                      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 5,912,000,000 $ 6,070,000,000 5,888,000,000 6,949,000,000 7,067,000,000 7,068,000,000 $ 6,355,000,000 5,912,000,000 6,949,000,000   $ 5,913,000,000
Sales to noncontrolling interests (4,000,000) 199,000,000 $ (15,000,000) (7,000,000) $ (9,000,000) $ 1,000,000   180,000,000 (15,000,000)    
Noncontrolling Interest, Decrease Other               (188,000,000) 0    
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests $ 36,000,000 $ 26,000,000   $ (2,000,000)       $ 62,000,000 $ (2,000,000)