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Financial Statement Presentation New Accounting Pronouncement Adopted (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
agreement
Jun. 30, 2026
USD ($)
agreement
Jun. 30, 2025
USD ($)
Mar. 01, 2026
USD ($)
$ / shares
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cash and Cash Equivalent $ 1,800 $ 1,800     $ 1,382  
Restricted Cash and Cash Equivalent, Current 530 530     691  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 2,383 2,383 $ 2,201   2,162 $ 2,039
Accounts Receivable, Allowance for Credit Loss, Current 37 37     39  
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)   24 29      
Accounts Receivable, Allowance for Credit Loss, Writeoff   (23) (25)      
Financing Receivable, Allowance for Credit Loss, Recovery   (1) (1)      
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation     (1)      
Accounts and Financing Receivable, Allowance for Credit Loss 83 83 98   83 96
Additional Paid in Capital $ 5,888 $ 5,888     5,904  
Obligations Number Of Agreements | agreement 56 56        
Guarantor Obligations, Maximum Exposure, Undiscounted $ 4,710 $ 4,710        
Supplier Finance Program, Obligation 826 826     616  
Investment Tax Credit   535 354      
Proceeds Investment Tax Credits   466 309      
Restricted Cash And Debt Service Reserves 583 583     531  
Restricted Cash Held for Insurance $ 159 159     153  
Variable Interest Entity, Terms of Arrangements 3.1 billion          
Noncontrolling Interest in Variable Interest Entity $ 148 148     127  
Merger Agreement, Expected Consideration, Equity Interests Issued and Issuable, Cash Paid Per Acquiree Share | $ / shares       $ 15.00    
receivables from investment tax credit   69 45      
Noncash distributions to noncontrolling interests   69 45      
Deferred Income Taxes and Tax Credits   448 75      
Income Tax Benefit            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Investment Tax Credit   39 142      
Contribution From Noncontrolling Interest            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Investment Tax Credit   $ 496 212      
Secured Debt [Member] | Standby Letters of Credit [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Obligations Number Of Agreements | agreement 8 8        
Guarantor Obligations, Maximum Exposure, Undiscounted $ 159 $ 159        
Accrued Liabilities            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Supplier Finance Program, Obligation 684 684     391  
Accrued Liabilities | Minimum [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Supplier Finance Program, Obligation 1 1     1  
Accrued Liabilities | Maximum [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Supplier Finance Program, Obligation 63 63     51  
Mong Duong Subsidiary [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Selling Expense     5      
Other Entity [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Accounts Receivable, Allowance for Credit Loss, Current $ 6 6 7   $ 6 $ 29
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)   0 0      
Accounts Receivable, Allowance for Credit Loss, Writeoff   0 0      
Financing Receivable, Allowance for Credit Loss, Recovery   $ 0 0      
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation     $ (1)      
Horizon Parent, L.P.            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Business Combination, Termination Fee       $ 100    
Business Combination, Approximate Termination Fee       588    
AES Corp            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Business Combination, Termination Fee       $ 321