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Revenue from Contracts with Customers Accounted for in Accordance with ASC 606 - Summary of Disaggregation of Revenue from Contracts with Customers Accounted Under ASC 606 (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation Of Revenue [Line Items]        
Total Revenue $ 79 $ 127 $ 261 $ 391
Federal Government [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 2 4 6 19
Guarantor Agencies [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue   5 1 13
State and Local Government [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 27 56 95 144
Tolling Authorities [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 18 15 48 42
Hospitals and Other Healthcare Providers [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 32 47 111 173
Federal Education Loans [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue   5 1 14
Federal Education Loans [Member] | Federal Government [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue       1
Federal Education Loans [Member] | Guarantor Agencies [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue   5 1 13
Business Processing [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 79 122 260 377
Business Processing [Member] | Federal Government [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 2 4 6 18
Business Processing [Member] | State and Local Government [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 27 56 95 144
Business Processing [Member] | Tolling Authorities [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 18 15 48 42
Business Processing [Member] | Hospitals and Other Healthcare Providers [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 32 47 111 173
Federal Education Loan Asset Recovery Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue   5 1 14
Federal Education Loan Asset Recovery Services [Member] | Federal Education Loans [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue   5 1 14
Government Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 47 75 149 204
Government Services [Member] | Business Processing [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 47 75 149 204
Healthcare Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 32 47 111 173
Healthcare Services [Member] | Business Processing [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue $ 32 $ 47 $ 111 $ 173