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Property and Equipment, Net (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Total property and equipment, at cost $ 2,109 $ 1,875
Less: accumulated depreciation and amortization (1,453) (1,272)
Total property and equipment, net 656 603
Office and Computer Equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment, at cost $ 400 354
Office and Computer Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment useful life 3 years  
Office and Computer Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment useful life 10 years  
Office Furniture and Fixtures    
Property, Plant and Equipment [Line Items]    
Total property and equipment, at cost $ 57 57
Office Furniture and Fixtures | Minimum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment useful life 3 years  
Office Furniture and Fixtures | Maximum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment useful life 10 years  
Internal-use Computer Software    
Property, Plant and Equipment [Line Items]    
Total property and equipment, at cost $ 1,417 1,232
Internal-use Computer Software | Minimum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment useful life 1 year  
Internal-use Computer Software | Maximum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment useful life 10 years  
Leasehold Improvements and Building    
Property, Plant and Equipment [Line Items]    
Total property and equipment, at cost $ 235 $ 232
Leasehold Improvements and Building | Minimum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment useful life 1 year  
Leasehold Improvements and Building | Maximum    
Property, Plant and Equipment [Line Items]    
Property plant and equipment useful life 20 years