Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Property and Equipment (Details)

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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Total property and equipment, at cost $ 209 $ 232
Finance lease right-of-use assets    
Property, Plant and Equipment [Line Items]    
Total property and equipment, at cost 114 114
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property and equipment, at cost 24 37
Computer equipment and purchased software    
Property, Plant and Equipment [Line Items]    
Total property and equipment, at cost 56 64
Furniture, office equipment and other    
Property, Plant and Equipment [Line Items]    
Total property and equipment, at cost $ 15 $ 17
Computer Equipment, Furniture, Office Equipment and Other | Minimum    
Property, Plant and Equipment [Line Items]    
Property estimated useful life 3 years  
Computer Equipment, Furniture, Office Equipment and Other | Maximum    
Property, Plant and Equipment [Line Items]    
Property estimated useful life 5 years