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Debt (Schedule of Line of Credit Facilities) (Details) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 928  
Syndicated Credit Facility $850 Million [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 850 $ 850
Long-term Line of Credit [1] $ 0 1
Line of Credit Facility, Interest Rate Description Credit rating  
Credit Facility 100 Million [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 100  
Long-term Line of Credit [1] $ 97 97
Line of Credit Facility, Interest Rate Description Fixed  
Foreign Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity [2] $ 3  
Long-term Line of Credit [1],[2] $ 3 3
Line of Credit Facility, Interest Rate Description [2] Fixed  
Syndicated Credit Facility $500 Million [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 500  
Long-term Line of Credit [1] $ 99 346
Line of Credit Facility, Interest Rate Description Credit rating and utilization %  
Credit Facility 100 Million (2024)    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 100  
Long-term Line of Credit [1] $ 29 30
Line of Credit Facility, Interest Rate Description Fixed  
Credit Facility 125 Million    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 125  
Long-term Line of Credit [1] $ 104 103
Line of Credit Facility, Interest Rate Description Fixed  
Credit Facility 100 Million (2025)    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 100  
Long-term Line of Credit [1] $ 60 $ 70
Line of Credit Facility, Interest Rate Description Fixed  
[1] Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.
[2] Foreign currency denominated facility, amounts presented are in U.S. dollars.