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Debt and Letters of Credit - Narrative (Details)
€ in Millions, $ in Millions
9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
EUR (€)
Financing Arrangements      
Repayments of debt $ 37 $ 44  
2028 Notes (4.250% Senior Notes)      
Financing Arrangements      
Repayments of debt 37 $ 44  
Lines of Credit      
Financing Arrangements      
Long-term line of credit 409    
Lines of Credit | Committed Line of Credit      
Financing Arrangements      
Current borrowing capacity 902    
Lines of Credit | Uncommitted Line of Credit      
Financing Arrangements      
Long-term line of credit 918    
Lines of Credit | Revolving Loan And Letter Of Credit Facility Agreement | Committed Line of Credit      
Financing Arrangements      
Maximum borrowing capacity 2,200    
Lines of Credit | Revolving Loan And Letter Of Credit Facility Agreement | Committed Line of Credit | Subsidiaries      
Financing Arrangements      
Covenant minimum liquidity 1,100    
Covenant minimum liquidity, after repayments of debt $ 1,000    
Lines of Credit | Revolving Loan And Letter Of Credit Facility Agreement | Committed Line of Credit | Minimum      
Financing Arrangements      
Ratio of consolidated debt to tangible net worth (as a percent) 60.00%    
Lines of Credit | Revolving Loan And Letter Of Credit Facility Agreement | Committed Line of Credit | Maximum      
Financing Arrangements      
Ratio of consolidated debt to tangible net worth (as a percent) 100.00%    
Lines of Credit | Revolving Loan And Letter Of Credit Facility Agreement | Committed Line of Credit | Maximum | Subsidiaries      
Financing Arrangements      
Aggregate amount of debt $ 750   € 750