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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 2,911 $ 2,660  
Less: Accumulated depreciation (1,283) (1,054)  
Total 1,628 1,606  
Depreciation expense 523 247 $ 92
Land      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 54 61  
Data processing equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 1,666 1,483  
Data processing equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 3 years    
Data processing equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 5 years    
Buildings and leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 555 540  
Buildings and leasehold improvements | Minimum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 5 years    
Buildings and leasehold improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 40 years    
Furniture and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 636 $ 576  
Furniture and equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 5 years    
Furniture and equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 8 years