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, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]      
Property and equipment, net $ 88 $ 99  
Depreciation expense $ 49 46 $ 57
Building And Leasehold Improvements      
Property, Plant and Equipment [Line Items]      
Useful life 20 years    
Software and Software Development Costs      
Property, Plant and Equipment [Line Items]      
Property and equipment, net $ 47 56  
Depreciation expense $ 40 $ 37 $ 33
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