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Summary of Significant Accounting Policies (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Segment
Customer
Institution
Dec. 31, 2022
USD ($)
Customer
Dec. 31, 2021
Customer
Properties and Equipment      
Number of operating segments | Segment 1    
Number of financial institutions | Institution 4    
Restricted cash | $ $ 9 $ 10  
Sales Revenue, Net | Customer      
Properties and Equipment      
Number of customers | Customer 2 2 0
Sales Revenue, Net | Customer | Customer One      
Properties and Equipment      
Percentage of Total Sales 19.00% 13.00%  
Sales Revenue, Net | Customer | Customer Two      
Properties and Equipment      
Percentage of Total Sales 17.00% 11.00%  
Minimum      
Properties and Equipment      
Estimated useful life 3 years    
Maximum      
Properties and Equipment      
Estimated useful life 30 years