Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Property, Plant and Equipment) (Details)

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Summary of Significant Accounting Policies (Property, Plant and Equipment) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]      
Property and equipment, net $ 94 $ 88  
Depreciation expense 44 49 $ 46
Software and Software Development Costs      
Property, Plant and Equipment [Line Items]      
Property and equipment, net 50 47  
Depreciation expense $ 36 $ 40 $ 37
Building      
Property, Plant and Equipment [Line Items]      
Useful life 30 years    
Building improvements      
Property, Plant and Equipment [Line Items]      
Useful life 15 years    
Leasehold Improvements      
Property, Plant and Equipment [Line Items]      
Useful life 20 years    
Minimum | Furniture, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Minimum | Software and Software Development Costs      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Maximum | Furniture, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Useful life 7 years    
Maximum | Software and Software Development Costs      
Property, Plant and Equipment [Line Items]      
Useful life 5 years