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Segment Reporting - Segment Results and Reconciliations to GAAP (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Interest income: |  |
Cash and investments | $ 7 | $ 5
Total interest income | 1,015 | 1,051
Total interest expense | 675 | 565
Net interest income (loss) | 340 | 486
Less: provisions for loan losses | 107 | 111
Net interest income (loss) after provisions for loan losses | 233 | 375
Other income (loss): |  |
Servicing revenue | 76 | 82
Asset recovery and business processing revenue | 100 | 90
Other income (loss) | (24) | (12)
Total other income | 152 | 160
Expenses: |  |
Direct operating expenses | 176 | 186
Overhead expenses | 62 | 61
Total operating expenses | 238 | 247
Goodwill and acquired intangible asset impairment and amortization | 6 | 4
Total expenses | 244 | 251
Income (loss) before income tax expense (benefit) | 141 | 284
Income tax expense (benefit) | 53 | 103
Net income (loss) | 88 | 181
Education Loan Portfolio [Member] |  |
Interest income: |  |
Total interest income | 1,003 | 1,045
Other Loans [Member] |  |
Interest income: |  |
Total interest income | 5 | 1
Reclassifications [Member] |  |
Interest income: |  |
Total interest income | 20 | 138
Total interest expense | 3 | 9
Net interest income (loss) | 17 | 129
Net interest income (loss) after provisions for loan losses | 17 | 129
Other income (loss): |  |
Other income (loss) | (17) | (129)
Total other income | (17) | (129)
Reclassifications [Member] | Education Loan Portfolio [Member] |  |
Interest income: |  |
Total interest income | 20 | 138
Additions/ (Subtractions) [Member] |  |
Interest income: |  |
Total interest income | (14) | (59)
Total interest expense | (3) |
Net interest income (loss) | (11) | (59)
Net interest income (loss) after provisions for loan losses | (11) | (59)
Other income (loss): |  |
Other income (loss) | (12) | 113
Total other income | (12) | 113
Expenses: |  |
Goodwill and acquired intangible asset impairment and amortization | 6 | 4
Total expenses | 6 | 4
Income (loss) before income tax expense (benefit) | (29) | 50
Income tax expense (benefit) | (10) | 16
Net income (loss) | (19) | 34
Additions/ (Subtractions) [Member] | Education Loan Portfolio [Member] |  |
Interest income: |  |
Total interest income | (14) | (59)
Total Adjustments [Member] |  |
Interest income: |  |
Total interest income | 6 | 79
Total interest expense |  | 9
Net interest income (loss) | 6 | 70
Net interest income (loss) after provisions for loan losses | 6 | 70
Other income (loss): |  |
Other income (loss) | (29) | (16)
Total other income | (29) | (16)
Expenses: |  |
Goodwill and acquired intangible asset impairment and amortization | 6 | 4
Total expenses | 6 | 4
Income (loss) before income tax expense (benefit) | (29) | 50
Income tax expense (benefit) | (10) | 16
Net income (loss) | (19) | 34
Total Adjustments [Member] | Education Loan Portfolio [Member] |  |
Interest income: |  |
Total interest income | 6 | 79
Operating Segments [Member] |  |
Interest income: |  |
Cash and investments | 7 | 5
Total interest income | 1,009 | 972
Total interest expense | 675 | 556
Net interest income (loss) | 334 | 416
Less: provisions for loan losses | 107 | 111
Net interest income (loss) after provisions for loan losses | 227 | 305
Other income (loss): |  |
Servicing revenue | 76 | 82
Asset recovery and business processing revenue | 100 | 90
Other income (loss) | 5 | 4
Total other income | 181 | 176
Expenses: |  |
Direct operating expenses | 176 | 186
Overhead expenses | 62 | 61
Total operating expenses | 238 | 247
Total expenses | 238 | 247
Income (loss) before income tax expense (benefit) | 170 | 234
Income tax expense (benefit) | 63 | 87
Net income (loss) | 107 | 147
Operating Segments [Member] | Education Loan Portfolio [Member] |  |
Interest income: |  |
Total interest income | 997 | 966
Operating Segments [Member] | Other Loans [Member] |  |
Interest income: |  |
Total interest income | 5 | 1
Operating Segments [Member] | FFELP Loans Segment [Member] |  |
Interest income: |  |
Cash and investments | 5 | 3
Total interest income | 628 | 558
Total interest expense | 457 | 358
Net interest income (loss) | 171 | 200
Less: provisions for loan losses | 10 | 7
Net interest income (loss) after provisions for loan losses | 161 | 193
Other income (loss): |  |
Servicing revenue | 13 | 16
Total other income | 13 | 16
Expenses: |  |
Direct operating expenses | 93 | 104
Total operating expenses | 93 | 104
Total expenses | 93 | 104
Income (loss) before income tax expense (benefit) | 81 | 105
Income tax expense (benefit) | 30 | 39
Net income (loss) | 51 | 66
Operating Segments [Member] | FFELP Loans Segment [Member] | Education Loan Portfolio [Member] |  |
Interest income: |  |
Total interest income | 623 | 555
Operating Segments [Member] | Private Education Loans Segment [Member] |  |
Interest income: |  |
Cash and investments |  | 1
Total interest income | 374 | 412
Total interest expense | 187 | 172
Net interest income (loss) | 187 | 240
Less: provisions for loan losses | 95 | 104
Net interest income (loss) after provisions for loan losses | 92 | 136
Other income (loss): |  |
Servicing revenue | 4 | 4
Total other income | 4 | 4
Expenses: |  |
Direct operating expenses | 40 | 43
Total operating expenses | 40 | 43
Total expenses | 40 | 43
Income (loss) before income tax expense (benefit) | 56 | 97
Income tax expense (benefit) | 21 | 36
Net income (loss) | 35 | 61
Operating Segments [Member] | Private Education Loans Segment [Member] | Education Loan Portfolio [Member] |  |
Interest income: |  |
Total interest income | 374 | 411
Operating Segments [Member] | Business Services Segment [Member] |  |
Other income (loss): |  |
Servicing revenue | 149 | 163
Asset recovery and business processing revenue | 100 | 90
Other income (loss) |  | 1
Total other income | 249 | 254
Expenses: |  |
Direct operating expenses | 126 | 134
Total operating expenses | 126 | 134
Total expenses | 126 | 134
Income (loss) before income tax expense (benefit) | 123 | 120
Income tax expense (benefit) | 46 | 45
Net income (loss) | 77 | 75
Operating Segments [Member] | Other Segment [Member] |  |
Interest income: |  |
Cash and investments | 2 | 1
Total interest income | 7 | 2
Total interest expense | 31 | 26
Net interest income (loss) | (24) | (24)
Less: provisions for loan losses | 2 |
Net interest income (loss) after provisions for loan losses | (26) | (24)
Other income (loss): |  |
Other income (loss) | 5 | 3
Total other income | 5 | 3
Expenses: |  |
Direct operating expenses | 7 | 6
Overhead expenses | 62 | 61
Total operating expenses | 69 | 67
Total expenses | 69 | 67
Income (loss) before income tax expense (benefit) | (90) | (88)
Income tax expense (benefit) | (34) | (33)
Net income (loss) | (56) | (55)
Operating Segments [Member] | Other Segment [Member] | Other Loans [Member] |  |
Interest income: |  |
Total interest income | 5 | 1
Eliminations [Member] |  |
Other income (loss): |  |
Servicing revenue | (90) | (101)
Total other income | (90) | (101)
Expenses: |  |
Direct operating expenses | (90) | (101)
Total operating expenses | (90) | (101)
Total expenses | $ (90) | $ (101)

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