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Property and Equipment - Schedule of Property and Equipment, Net (Detail) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Property, Plant, and Equipment [Line Items]    
Property and equipment, gross $ 4,391 $ 4,125
Less: Accumulated depreciation (2,246) (1,836)
Property and equipment, net 2,145 2,289
Computer equipment    
Property, Plant, and Equipment [Line Items]    
Property and equipment, gross 3,437 3,332
Computer software    
Property, Plant, and Equipment [Line Items]    
Property and equipment, gross 170 126
Leasehold and other improvements    
Property, Plant, and Equipment [Line Items]    
Property and equipment, gross 514 433
Furniture and fixtures    
Property, Plant, and Equipment [Line Items]    
Property and equipment, gross 124 117
Construction in progress    
Property, Plant, and Equipment [Line Items]    
Property and equipment, gross $ 146 $ 117