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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)