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Property and Equipment, net (Schedule Of Property And Equipment, Net) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 30 years    
Property and Equipment, gross $ 3,781 $ 3,820  
Accumulated depreciation and amortization (2,787) (2,772)  
Property and equipment, net 994 1,048  
Finance Lease, Right-of-Use Asset, Accumulated Amortization 16 13  
Finance Lease, Right-of-Use Asset, Amortization 5 4 $ 4
Capitalized Computer Software, Amortization 36 37 $ 37
Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Property and Equipment, gross 736 769  
Computer Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and Equipment, gross $ 811 794  
Computer Equipment [Member] | Minimum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 3 years    
Computer Equipment [Member] | Maximum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 5 years    
Computer Software [Member]      
Property, Plant and Equipment [Line Items]      
Property and Equipment, gross $ 1,024 1,007  
Computer Software [Member] | Minimum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 3 years    
Computer Software [Member] | Maximum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 8 years    
Furniture and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and Equipment, gross $ 716 733  
Furniture and Equipment [Member] | Minimum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 5 years    
Furniture and Equipment [Member] | Maximum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 9 years    
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property and Equipment, gross $ 6 7  
Capital Work-in-Progress [Member]      
Property, Plant and Equipment [Line Items]      
Property and Equipment, gross 115 88  
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property and Equipment, gross $ 373 $ 422