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Redeemable Stocks of Subsidiaries (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Apr. 30, 2025
Apr. 04, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Temporary Equity [Line Items]                    
Redeemable Noncontrolling Interest, Equity, Carrying Amount       $ 3,052,000,000   $ 3,052,000,000   $ 2,824,000,000    
Temporary Equity, Other Charges       0 $ 0 (1,000,000) $ 0      
Temporary equity, Issuance of preferred shares in subsidiaries       0 440,000,000 112,000,000 440,000,000      
Temporary Equity, Interest in Subsidiary Earnings       63,000,000 168,000,000 63,000,000 168,000,000      
Temporary Equity, Stock Issued During Period, Value, New Issues       194,000,000 687,000,000 194,000,000 687,000,000      
Reclassifications of Temporary to Permanent Equity       0 (18,000,000) 0 (56,000,000)      
Temporary Equity, Including Noncontrolling Interest $ 2,895,000,000     3,052,000,000 2,179,000,000 3,052,000,000 2,179,000,000 2,824,000,000 $ 899,000,000 $ 938,000,000
Temporary Equity, Net Income       (36,000,000) 3,000,000 (37,000,000) 33,000,000      
Temporary Equity, Adjustments to redemption value of redeemable stock of subsidiaries       0 10,000,000   10,000,000      
Redeemable Preferred Stock Dividends       (64,000,000) (10,000,000) (103,000,000) (41,000,000)      
IPALCO Enterprises, Inc. [Member]                    
Temporary Equity [Line Items]                    
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount       1,006,000,000   1,006,000,000   1,003,000,000    
AES Clean Energy Development                    
Temporary Equity [Line Items]                    
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount       273,000,000   273,000,000   228,000,000    
AES Ohio                    
Temporary Equity [Line Items]                    
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount       644,000,000   644,000,000   595,000,000    
Temporary Equity, Stock Issued During Period, Value, New Issues     $ 538,000,000              
Sale of Stock, Percentage of Ownership before Transaction     30.00%              
Proceeds from sale of ownership interest     $ 544,000,000              
Adjustments to Additional Paid in Capital, Other     $ 188,000,000              
AES Global Insurance                    
Temporary Equity [Line Items]                    
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount       448,000,000 456,000,000 448,000,000 456,000,000 472,000,000    
Temporary Equity, Adjustments to redemption value of redeemable stock of subsidiaries         10,000,000          
Sale of Stock, Percentage of Ownership before Transaction   17.50%                
Proceeds from Sales of Business, Affiliate and Productive Assets   $ 450,000,000                
Bellefield                    
Temporary Equity [Line Items]                    
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount       262,000,000   262,000,000   249,000,000    
AES DevCO HoldCo                    
Temporary Equity [Line Items]                    
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount       209,000,000   209,000,000   199,000,000    
Desarrollos Renovables                    
Temporary Equity [Line Items]                    
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount       $ 210,000,000   $ 210,000,000   $ 78,000,000    
Sale of Stock, Percentage of Ownership before Transaction 49.00%                  
Proceeds from sale of ownership interest $ 112,000,000                  
Desarrollos Renovables | AES Pacifico                    
Temporary Equity [Line Items]                    
Noncontrolling Interest, Ownership Percentage by Parent       51.00%   51.00%        
AES Indiana Pike County BESS                    
Temporary Equity [Line Items]                    
Reclassifications of Temporary to Permanent Equity         $ 38,000,000          
AES Clean Energy Subsidiary                    
Temporary Equity [Line Items]                    
Temporary Equity, Stock Issued During Period, Value, New Issues           $ 194,000,000 149,000,000      
Reclassifications of Temporary to Permanent Equity             $ 18,000,000      
AES AGIC Holdings                    
Temporary Equity [Line Items]                    
Sale of Stock, Percentage of Ownership before Transaction   18.00%                
Incentive Distribution, Distribution   $ 146,000,000                
Cash Available for Distributions   $ 199,000,000                
AES Global Insurance and AGIC, Combined                    
Temporary Equity [Line Items]                    
Sale of Stock, Percentage of Ownership before Transaction   32.40%