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Debt and Lines of Credit - Narrative (Details)
€ in Millions, $ in Millions
1 Months Ended 9 Months Ended
Jun. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
EUR (€)
Financing Arrangements          
Repayments of debt     $ 23 $ 525  
2023 Notes          
Financing Arrangements          
Repayments of debt $ 23        
Debt instrument, face amount   $ 375   375  
2024 Notes          
Financing Arrangements          
Amount outstanding under credit facilities   108   $ 108  
Senior Notes 1.750%, Due 2023 and Senior Notes 3.50%, Due 2024          
Financing Arrangements          
Repayments of debt   26      
Loss on debt redemptions   $ 20      
Lines of credit          
Financing Arrangements          
Amount outstanding under credit facilities     332    
Lines of credit | Committed Line of Credit          
Financing Arrangements          
Current borrowing capacity     845    
Lines of credit | Committed Line of Credit | Revolving Loan And Letter Of Credit Facility Agreement          
Financing Arrangements          
Maximum borrowing capacity     1,800    
Lines of credit | Committed Line of Credit | Revolving Loan And Letter Of Credit Facility Agreement | Subsidiaries          
Financing Arrangements          
Covenant minimum liquidity     1,200    
Covenant minimum liquidity, after repayments of debt     $ 1,000    
Lines of credit | Committed Line of Credit | Revolving Loan And Letter Of Credit Facility Agreement | Minimum          
Financing Arrangements          
Ratio of consolidated debt to tangible net worth (as a percent)     60.00%    
Lines of credit | Committed Line of Credit | Revolving Loan And Letter Of Credit Facility Agreement | Maximum          
Financing Arrangements          
Ratio of consolidated debt to tangible net worth (as a percent)     100.00%    
Lines of credit | Committed Line of Credit | Revolving Loan And Letter Of Credit Facility Agreement | Maximum | Subsidiaries          
Financing Arrangements          
Aggregate amount of debt     $ 750   € 750
Lines of credit | Uncommitted Line of Credit          
Financing Arrangements          
Amount outstanding under credit facilities     $ 877