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Revenue from Contract with Customers Accounted for in Accordance with ASC 606 - Summary of Disaggregation of Revenue from Contracts Accounted Under ASC 606 with Customers (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | $ 100 | $ 84 | $ 198 | $ 177
Federal Government [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 21 | 3 | 37 | 5
Guarantor Agencies [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 14 | 15 | 28 | 31
Other Institutions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 4 | 3 | 6 | 6
State and Local Government [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 23 | 23 | 48 | 49
Tolling Authorities [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 13 | 16 | 27 | 42
Hospitals and Other Healthcare Providers [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 25 | 24 | 52 | 44
Federal Education Loans [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 35 | 19 | 64 | 39
Federal Education Loans [Member] | Federal Government [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 17 | 1 | 30 | 2
Federal Education Loans [Member] | Guarantor Agencies [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 14 | 15 | 28 | 31
Federal Education Loans [Member] | Other Institutions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 4 | 3 | 6 | 6
Business Processing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 65 | 65 | 134 | 138
Business Processing [Member] | Federal Government [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 4 | 2 | 7 | 3
Business Processing [Member] | State and Local Government [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 23 | 23 | 48 | 49
Business Processing [Member] | Tolling Authorities [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 13 | 16 | 27 | 42
Business Processing [Member] | Hospitals and Other Healthcare Providers [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 25 | 24 | 52 | 44
Federal Education Loan Asset Recovery Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 35 | 19 | 64 | 39
Federal Education Loan Asset Recovery Services [Member] | Federal Education Loans [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 35 | 19 | 64 | 39
Government Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 40 | 41 | 82 | 94
Government Services [Member] | Business Processing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 40 | 41 | 82 | 94
Healthcare Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | 25 | 24 | 52 | 44
Healthcare Services [Member] | Business Processing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total Revenue | $ 25 | $ 24 | $ 52 | $ 44

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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