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Debt and Letters of Credit (Details) - 6 months ended Jun. 30, 2020 - Line of Credit
€ in Millions, $ in Millions
USD ($)
EUR (€)
Financing Arrangements    
Amount outstanding under credit facilities $ 463  
Committed Credit Line    
Financing Arrangements    
Line of Credit Facility, Current Borrowing Capacity 632  
Committed Credit Line | Revolving Loan and Letter Of Credit Facility Agreement 1.7 Billion    
Financing Arrangements    
Maximum borrowing capacity 1,700  
Committed Credit Line | Revolving Loan and Letter Of Credit Facility Agreement    
Financing Arrangements    
Maximum borrowing capacity 1,800  
Uncommitted Credit Line    
Financing Arrangements    
Amount outstanding under credit facilities $ 880  
Minimum | Committed Credit Line | Revolving Loan and Letter Of Credit Facility Agreement 1.7 Billion    
Financing Arrangements    
Ratio of consolidated debt to tangible net worth (as a percent) 60.00%  
Maximum | Committed Credit Line | Revolving Loan and Letter Of Credit Facility Agreement 1.7 Billion    
Financing Arrangements    
Ratio of consolidated debt to tangible net worth (as a percent) 100.00%  
Subsidiaries | Minimum | Committed Credit Line | Revolving Loan and Letter Of Credit Facility Agreement 1.7 Billion    
Financing Arrangements    
Aggregate amount of debt | €   € 750
Subsidiaries | Maximum | Committed Credit Line | Revolving Loan and Letter Of Credit Facility Agreement 1.7 Billion    
Financing Arrangements    
Aggregate amount of debt $ 750