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Debt and Letters of Credit - Credit Facility (Details) - 12 months ended Dec. 31, 2025 - Lines of credit
€ in Millions, $ in Millions
USD ($)
EUR (€)
Line of Credit Facility [Line Items]    
Credit facility $ 424  
Committed Credit Line    
Line of Credit Facility [Line Items]    
Letters of credit outstanding 901  
Revolving Loan and Letter of Credit Facility | Committed Credit Line    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity 2,200  
Revolving Loan and Letter of Credit Facility | Committed Credit Line | Subsidiaries    
Line of Credit Facility [Line Items]    
Covenant minimum liquidity 1,100  
Covenant, minimum liquidity after repayments of debt $ 1,000  
Revolving Loan and Letter of Credit Facility | Committed Credit Line | Minimum    
Line of Credit Facility [Line Items]    
Debt-to-capitalization ratio (cannot exceed) 60.00%  
Revolving Loan and Letter of Credit Facility | Committed Credit Line | Maximum | Subsidiaries    
Line of Credit Facility [Line Items]    
Cap on aggregate amount of debt (greater of) $ 750 € 750