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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation Of Revenue [Line Items]        
Total Revenue $ 134 $ 85 $ 264 $ 173
Federal Government [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 6 14 15 37
Guarantor Agencies [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 4 9 8 21
Other Institutions [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue   1   1
State and Local Government [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 46 29 88 45
Tolling Authorities [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 14 11 27 24
Hospitals and Other Healthcare Providers [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 64 21 126 45
Federal Education Loans [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 4 21 9 51
Federal Education Loans [Member] | Federal Government [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue   11 1 29
Federal Education Loans [Member] | Guarantor Agencies [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 4 9 8 21
Federal Education Loans [Member] | Other Institutions [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue   1   1
Business Processing [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 130 64 255 122
Business Processing [Member] | Federal Government [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 6 3 14 8
Business Processing [Member] | State and Local Government [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 46 29 88 45
Business Processing [Member] | Tolling Authorities [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 14 11 27 24
Business Processing [Member] | Hospitals and Other Healthcare Providers [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 64 21 126 45
Federal Education Loan Asset Recovery Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 4 21 9 51
Federal Education Loan Asset Recovery Services [Member] | Federal Education Loans [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 4 21 9 51
Government Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 66 43 129 77
Government Services [Member] | Business Processing [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 66 43 129 77
Healthcare Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 64 21 126 45
Healthcare Services [Member] | Business Processing [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue $ 64 $ 21 $ 126 $ 45