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Segment Reporting - Segment Results and Reconciliations to GAAP (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Interest income: |  |  |  |
Cash and investments | $ 22 | $ 48 | $ 43 | $ 86
Total interest income | 778 | 973 | 1,580 | 2,000
Total interest expense | 650 | 843 | 1,322 | 1,718
Net interest income (loss) | 128 | 130 | 258 | 282
Less: provisions for loan losses | 37 | 14 | 67 | 26
Net interest income (loss) after provisions for loan losses | 91 | 116 | 191 | 256
Other income (loss): |  |  |  |
Servicing revenue | 14 | 18 | 27 | 35
Asset recovery and business processing revenue | 0 | 81 | 23 | 158
Other revenue (loss) | 14 | 18 |  | 59
Total other income (loss) | 28 | 117 | 53 | 252
Expenses: |  |  |  |
Direct operating expenses | 53 | 112 | 127 | 231
Unallocated shared services expenses | 47 | 54 | 100 | 119
Total operating expenses | 100 | 166 | 227 | 350
Goodwill and acquired intangible asset impairment and amortization | 1 | 3 | 2 | 5
Restructuring/other reorganization expenses | 0 | 16 | 3 | 17
Total expenses | 101 | 185 | 232 | 372
Income before income tax expense | 18 | 48 | 12 | 136
Income tax expense (benefit) | 4 | 12 | 1 | 27
Net income | 14 | 36 | 11 | 109
Federal Education Loans [Member] |  |  |  |
Expenses: |  |  |  |
Total operating expenses | 17 | 16 | 37 | 33
Business Processing [Member] |  |  |  |
Expenses: |  |  |  |
Total operating expenses | 0 | 62 | 20 | 131
Other Segment [Member] |  |  |  |
Expenses: |  |  |  |
Total operating expenses | 47 | 54 | 100 | 119
Operating Segments [Member] |  |  |  |
Interest income: |  |  |  |
Net interest income (loss) | 131 | 136 | 275 | 299
Less: provisions for loan losses | 37 | 14 | 67 | 26
Other income (loss): |  |  |  |
Total other income (loss) | 33 | 103 | 83 | 206
Expenses: |  |  |  |
Total operating expenses | 100 | 166 | 227 | 350
Goodwill and acquired intangible asset impairment and amortization | 0 | 0 | 0 | 0
Restructuring/other reorganization expenses | 0 | 16 | 3 | 17
Total expenses | 100 | 182 | 230 | 367
Income before income tax expense | 27 | 43 | 61 | 112
Income tax expense (benefit) | 6 | 10 | 14 | 26
Net income | 21 | 33 | 47 | 86
Operating Segments [Member] | Federal Education Loans [Member] |  |  |  |
Interest income: |  |  |  |
Cash and investments | 10 | 28 | 20 | 51
Total interest income | 493 | 636 | 995 | 1,320
Total interest expense | 438 | 603 | 892 | 1,233
Net interest income (loss) | 55 | 33 | 103 | 87
Less: provisions for loan losses | 8 | (2) | 16 | (1)
Net interest income (loss) after provisions for loan losses | 47 | 35 | 87 | 88
Other income (loss): |  |  |  |
Servicing revenue | 11 | 15 | 21 | 28
Asset recovery and business processing revenue | 0 | 0 | 0 | 0
Other revenue (loss) | (1) | 2 | (1) | 5
Total other income (loss) | 10 | 17 | 20 | 33
Expenses: |  |  |  |
Direct operating expenses | 17 | 16 | 37 | 33
Unallocated shared services expenses | 0 | 0 | 0 | 0
Total operating expenses | 17 | 16 | 37 | 33
Goodwill and acquired intangible asset impairment and amortization | 0 | 0 | 0 | 0
Restructuring/other reorganization expenses | 0 | 0 | 0 | 0
Total expenses | 17 | 16 | 37 | 33
Income before income tax expense | 40 | 36 | 70 | 88
Income tax expense (benefit) | 10 | 8 | 16 | 20
Net income | 30 | 28 | 54 | 68
Operating Segments [Member] | Consumer Lending [Member] |  |  |  |
Interest income: |  |  |  |
Cash and investments | 5 | 7 | 10 | 14
Total interest income | 278 | 324 | 572 | 659
Total interest expense | 183 | 198 | 364 | 400
Net interest income (loss) | 95 | 126 | 208 | 259
Less: provisions for loan losses | 29 | 16 | 51 | 27
Net interest income (loss) after provisions for loan losses | 66 | 110 | 157 | 232
Other income (loss): |  |  |  |
Servicing revenue | 3 | 3 | 6 | 7
Asset recovery and business processing revenue | 0 | 0 | 0 | 0
Other revenue (loss) | 0 | 0 | 0 | 1
Total other income (loss) | 3 | 3 | 6 | 8
Expenses: |  |  |  |
Direct operating expenses | 36 | 34 | 70 | 67
Unallocated shared services expenses | 0 | 0 | 0 | 0
Total operating expenses | 36 | 34 | 70 | 67
Goodwill and acquired intangible asset impairment and amortization | 0 | 0 | 0 | 0
Restructuring/other reorganization expenses | 0 | 0 | 0 | 0
Total expenses | 36 | 34 | 70 | 67
Income before income tax expense | 33 | 79 | 93 | 173
Income tax expense (benefit) | 7 | 19 | 21 | 40
Net income | 26 | 60 | 72 | 133
Operating Segments [Member] | Business Processing [Member] |  |  |  |
Interest income: |  |  |  |
Cash and investments | 0 | 0 | 0 | 0
Total interest income | 0 | 0 | 0 | 0
Total interest expense | 0 | 0 | 0 | 0
Net interest income (loss) | 0 | 0 | 0 | 0
Less: provisions for loan losses | 0 | 0 | 0 | 0
Net interest income (loss) after provisions for loan losses | 0 | 0 | 0 | 0
Other income (loss): |  |  |  |
Servicing revenue | 0 | 0 | 0 | 0
Asset recovery and business processing revenue | 0 | 81 | 23 | 158
Other revenue (loss) | 0 | 0 | 0 | 0
Total other income (loss) | 0 | 81 | 23 | 158
Expenses: |  |  |  |
Direct operating expenses | 0 | 62 | 20 | 131
Unallocated shared services expenses | 0 | 0 | 0 | 0
Total operating expenses | 0 | 62 | 20 | 131
Goodwill and acquired intangible asset impairment and amortization | 0 | 0 | 0 | 0
Restructuring/other reorganization expenses | 0 | 0 | 0 | 0
Total expenses | 0 | 62 | 20 | 131
Income before income tax expense | 0 | 19 | 3 | 27
Income tax expense (benefit) | 0 | 4 | 1 | 6
Net income | 0 | 15 | 2 | 21
Operating Segments [Member] | Other Segment [Member] |  |  |  |
Interest income: |  |  |  |
Cash and investments | 7 | 13 | 13 | 21
Total interest income | 7 | 13 | 13 | 21
Total interest expense | 26 | 36 | 49 | 68
Net interest income (loss) | (19) | (23) | (36) | (47)
Less: provisions for loan losses | 0 | 0 | 0 | 0
Net interest income (loss) after provisions for loan losses | (19) | (23) | (36) | (47)
Other income (loss): |  |  |  |
Servicing revenue | 0 | 0 | 0 | 0
Asset recovery and business processing revenue | 0 | 0 | 0 | 0
Other revenue (loss) | 20 | 2 | 34 | 7
Total other income (loss) | 20 | 2 | 34 | 7
Expenses: |  |  |  |
Direct operating expenses | 0 | 0 | 0 | 0
Unallocated shared services expenses | 47 | 54 | 100 | 119
Total operating expenses | 47 | 54 | 100 | 119
Goodwill and acquired intangible asset impairment and amortization | 0 | 0 | 0 | 0
Restructuring/other reorganization expenses | 0 | 16 | 3 | 17
Total expenses | 47 | 70 | 103 | 136
Income before income tax expense | (46) | (91) | (105) | (176)
Income tax expense (benefit) | (11) | (21) | 24 | (40)
Net income | (35) | (70) | (81) | (136)
Adjustments [Member] | Reclassifications [Member] |  |  |  |
Interest income: |  |  |  |
Net interest income (loss) | 5 | 9 | 11 | 19
Other income (loss): |  |  |  |
Total other income (loss) | (5) | (9) | (11) | (19)
Expenses: |  |  |  |
Total operating expenses | 0 | 0 | 0 | 0
Goodwill and acquired intangible asset impairment and amortization | 0 | 0 | 0 | 0
Restructuring/other reorganization expenses | 0 | 0 | 0 | 0
Total expenses | 0 | 0 | 0 | 0
Income before income tax expense | 0 | 0 | 0 | 0
Income tax expense (benefit) | 0 | 0 | 0 | 0
Net income | 0 | 0 | 0 | 0
Adjustments [Member] | Additions (Subtractions) [Member] |  |  |  |
Interest income: |  |  |  |
Net interest income (loss) | (2) | (3) | 6 | (2)
Other income (loss): |  |  |  |
Total other income (loss) | 10 | (5) | 41 | (27)
Expenses: |  |  |  |
Total operating expenses | 0 | 0 | 0 | 0
Goodwill and acquired intangible asset impairment and amortization | (1) | (3) | (2) | (5)
Restructuring/other reorganization expenses | 0 | 0 | 0 | 0
Total expenses | (1) | (3) | (2) | (5)
Income before income tax expense | 9 | (5) | 49 | (24)
Income tax expense (benefit) | 2 | (2) | 13 | (1)
Net income | 7 | (3) | 36 | (23)
Adjustments [Member] | Total Adjustments [Member] |  |  |  |
Interest income: |  |  |  |
Net interest income (loss) | 3 | 6 | 17 | 17
Net interest income (loss) after provisions for loan losses | 3 | 6 | 17 | 17
Other income (loss): |  |  |  |
Total other income (loss) | 5 | (14) | 30 | (46)
Expenses: |  |  |  |
Total operating expenses | 0 | 0 | 0 | 0
Goodwill and acquired intangible asset impairment and amortization | (1) | (3) | (2) | (5)
Restructuring/other reorganization expenses | 0 | 0 | 0 | 0
Total expenses | (1) | (3) | (2) | (5)
Income before income tax expense | 9 | (5) | 49 | (24)
Income tax expense (benefit) | 2 | (2) | 13 | (1)
Net income | 7 | (3) | 36 | (23)
Education Loan Portfolio [Member] |  |  |  |
Interest income: |  |  |  |
Total interest income | 756 | 925 | 1,537 | 1,914
Education Loan Portfolio [Member] | Operating Segments [Member] | Federal Education Loans [Member] |  |  |  |
Interest income: |  |  |  |
Total interest income | 483 | 608 | 975 | 1,269
Education Loan Portfolio [Member] | Operating Segments [Member] | Consumer Lending [Member] |  |  |  |
Interest income: |  |  |  |
Total interest income | 273 | 317 | 562 | 645
Education Loan Portfolio [Member] | Operating Segments [Member] | Business Processing [Member] |  |  |  |
Interest income: |  |  |  |
Total interest income | 0 | 0 | 0 | 0
Education Loan Portfolio [Member] | Operating Segments [Member] | Other Segment [Member] |  |  |  |
Interest income: |  |  |  |
Total interest income | $ 0 | $ 0 | $ 0 | $ 0

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