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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 | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | $ 321 | $ 332 | $ 507
Federal Government [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 62 | 8 | 21
Guarantor Agencies [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 2 | 18
Other Institutions [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 0 | 0
State and Local Government [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 68 | 116 | 183
Tolling Authorities [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 70 | 63 | 55
Hospitals and Other Healthcare Providers [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 121 | 143 | 230
Federal Education Loans [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 2 | 19
Federal Education Loans [Member] | Federal Government [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 0 | 1
Federal Education Loans [Member] | Guarantor Agencies [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 2 | 18
Federal Education Loans [Member] | Other Institutions [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 0 | 0
Federal Education Loans [Member] | State and Local Government [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 0 | 0
Federal Education Loans [Member] | Tolling Authorities [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 0 | 0
Federal Education Loans [Member] | Hospitals and Other Healthcare Providers [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 0 | 0
Business Processing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 321 | 330 | 488
Business Processing [Member] | Federal Government [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 62 | 8 | 20
Business Processing [Member] | Guarantor Agencies [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 0 | 0
Business Processing [Member] | Other Institutions [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 0 | 0
Business Processing [Member] | State and Local Government [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 68 | 116 | 183
Business Processing [Member] | Tolling Authorities [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 70 | 63 | 55
Business Processing [Member] | Hospitals and Other Healthcare Providers [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 121 | 143 | 230
Federal Education Loan Asset Recovery Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 2 | 19
Federal Education Loan Asset Recovery Services [Member] | Federal Education Loans [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 2 | 19
Federal Education Loan Asset Recovery Services [Member] | Business Processing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 0 | 0
Government Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 200 | 187 | 258
Government Services [Member] | Federal Education Loans [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 0 | 0
Government Services [Member] | Business Processing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 200 | 187 | 258
Healthcare Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 121 | 143 | 230
Healthcare Services [Member] | Federal Education Loans [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | 0 | 0 | 0
Healthcare Services [Member] | Business Processing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total Revenue | $ 121 | $ 143 | $ 230

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