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Property and Equipment - Summary of Property and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 2,709 $ 2,483
Accumulated depreciation and amortization 1,795 1,576
Property and equipment, net $ 914 907
Maximum    
Property, Plant and Equipment [Line Items]    
Useful Lives 10 years  
Computer hardware and software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,489 1,341
Computer hardware and software | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Lives 2 years  
Computer hardware and software | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Lives 10 years  
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 716 658
Leasehold improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Lives 1 year  
Leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Lives 15 years  
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 351 298
Furniture and equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Lives 1 year  
Furniture and equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Lives 10 years  
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 153 $ 186