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Segment Reporting - Segment Results and Reconciliations to GAAP (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Interest income:        
Cash and investments $ 1 $ 2 $ 1 $ 15
Total interest income 661 819 1,352 1,807
Total interest expense 339 519 667 1,234
Net interest income 322 300 685 573
Less: provisions for loan losses (1) 44 (88) 139
Net interest income after provisions for loan losses 323 256 773 434
Other income (loss):        
Servicing revenue 50 52 102 109
Asset recovery and business processing revenue 142 102 281 212
Other income (loss) (6) (21) 31 (236)
Losses on debt repurchases (12)   (12)  
Total other income (loss) 176 133 480 85
Gains on sales of loans 2   78  
Gains on sales of loans 2   78  
Losses on debt repurchases (12)   (12)  
Expenses:        
Direct operating expenses 186 161 379 336
Unallocated shared services expenses 66 52 131 127
Total operating expenses 252 213 510 463
Goodwill and acquired intangible asset impairment and amortization 5 5 10 11
Restructuring/other reorganization expenses 2 1 8 6
Total expenses 259 219 528 480
Income before income tax expense 240 170 725 39
Income tax expense (benefit) 55 45 170 20
Net income 185 125 555 19
Operating Segments [Member]        
Interest income:        
Cash and investments 1 2 1 15
Total interest income 647 820 1,324 1,819
Total interest expense 365 491 747 1,193
Net interest income 282 329 577 626
Less: provisions for loan losses (1) 44 (88) 139
Net interest income after provisions for loan losses 283 285 665 487
Other income (loss):        
Servicing revenue 50 52 102 109
Asset recovery and business processing revenue 142 102 281 212
Other income (loss) 4 9 5 17
Losses on debt repurchases (12)   (12)  
Total other income (loss) 186 163 467 338
Gains on sales of loans 2   91  
Gains on sales of loans 2   91  
Losses on debt repurchases (12)   (12)  
Expenses:        
Direct operating expenses 186 161 379 336
Unallocated shared services expenses 66 52 131 127
Total operating expenses 252 213 510 463
Restructuring/other reorganization expenses 2 1 8 6
Total expenses 254 214 518 469
Income before income tax expense 215 234 614 356
Income tax expense (benefit) 50 55 145 84
Net income 165 179 469 272
Operating Segments [Member] | Federal Education Loans [Member]        
Interest income:        
Cash and investments   1   7
Total interest income 351 457 709 1,044
Total interest expense 210 286 424 742
Net interest income 141 171 285 302
Less: provisions for loan losses   3   9
Net interest income after provisions for loan losses 141 168 285 293
Other income (loss):        
Servicing revenue 47 51 99 106
Asset recovery and business processing revenue 12 38 26 90
Other income (loss) 2 5 2 9
Total other income (loss) 61 94 127 205
Expenses:        
Direct operating expenses 55 70 117 153
Total operating expenses 55 70 117 153
Total expenses 55 70 117 153
Income before income tax expense 147 192 295 345
Income tax expense (benefit) 34 46 70 82
Net income 113 146 225 263
Operating Segments [Member] | Consumer Lending [Member]        
Interest income:        
Cash and investments       3
Total interest income 295 362 614 770
Total interest expense 137 174 287 385
Net interest income 158 188 327 385
Less: provisions for loan losses (1) 41 (88) 130
Net interest income after provisions for loan losses 159 147 415 255
Other income (loss):        
Servicing revenue 3 1 3 3
Other income (loss)     1  
Total other income (loss) 5 1 95 3
Gains on sales of loans 2   91  
Gains on sales of loans 2   91  
Expenses:        
Direct operating expenses 39 34 79 72
Total operating expenses 39 34 79 72
Total expenses 39 34 79 72
Income before income tax expense 125 114 431 186
Income tax expense (benefit) 29 27 101 43
Net income 96 87 330 143
Operating Segments [Member] | Business Processing [Member]        
Other income (loss):        
Asset recovery and business processing revenue 130 64 255 122
Total other income (loss) 130 64 255 122
Expenses:        
Direct operating expenses 92 57 183 111
Total operating expenses 92 57 183 111
Total expenses 92 57 183 111
Income before income tax expense 38 7 72 11
Income tax expense (benefit) 9 1 17 3
Net income 29 6 55 8
Operating Segments [Member] | Other Segment [Member]        
Interest income:        
Cash and investments 1 1 1 5
Total interest income 1 1 1 5
Total interest expense 18 31 36 66
Net interest income (17) (30) (35) (61)
Net interest income after provisions for loan losses (17) (30) (35) (61)
Other income (loss):        
Other income (loss) 2 4 2 8
Losses on debt repurchases (12)   (12)  
Total other income (loss) (10) 4 (10) 8
Losses on debt repurchases (12)   (12)  
Expenses:        
Unallocated shared services expenses 66 52 131 127
Total operating expenses 66 52 131 127
Restructuring/other reorganization expenses 2 1 8 6
Total expenses 68 53 139 133
Income before income tax expense (95) (79) (184) (186)
Income tax expense (benefit) (22) (19) (43) (44)
Net income (73) (60) (141) (142)
Adjustments [Member] | Reclassifications [Member]        
Interest income:        
Total interest income 24 13 48 16
Total interest expense (2) 25 (3) 32
Net interest income 26 (12) 51 (16)
Net interest income after provisions for loan losses 26 (12) 51 (16)
Other income (loss):        
Other income (loss) (26) 12 (38) 16
Total other income (loss) (26) 12 (51) 16
Gains on sales of loans     (13)  
Gains on sales of loans     (13)  
Adjustments [Member] | Additions (Subtractions) [Member]        
Interest income:        
Total interest income (10) (14) (20) (28)
Total interest expense (24) 3 (77) 9
Net interest income 14 (17) 57 (37)
Net interest income after provisions for loan losses 14 (17) 57 (37)
Other income (loss):        
Other income (loss) 16 (42) 64 (269)
Total other income (loss) 16 (42) 64 (269)
Expenses:        
Goodwill and acquired intangible asset impairment and amortization 5 5 10 11
Total expenses 5 5 10 11
Income before income tax expense 25 (64) 111 (317)
Income tax expense (benefit) 5 (10) 25 (64)
Net income 20 (54) 86 (253)
Adjustments [Member] | Total Adjustments [Member]        
Interest income:        
Total interest income 14 (1) 28 (12)
Total interest expense (26) 28 (80) 41
Net interest income 40 (29) 108 (53)
Net interest income after provisions for loan losses 40 (29) 108 (53)
Other income (loss):        
Other income (loss) (10) (30) 26 (253)
Total other income (loss) (10) (30) 13 (253)
Gains on sales of loans     (13)  
Gains on sales of loans     (13)  
Expenses:        
Goodwill and acquired intangible asset impairment and amortization 5 5 10 11
Total expenses 5 5 10 11
Income before income tax expense 25 (64) 111 (317)
Income tax expense (benefit) 5 (10) 25 (64)
Net income 20 (54) 86 (253)
Education Loan Portfolio [Member]        
Interest income:        
Total interest income 660 817 1,351 1,792
Education Loan Portfolio [Member] | Operating Segments [Member]        
Interest income:        
Total interest income 646 818 1,323 1,804
Education Loan Portfolio [Member] | Operating Segments [Member] | Federal Education Loans [Member]        
Interest income:        
Total interest income 351 456 709 1,037
Education Loan Portfolio [Member] | Operating Segments [Member] | Consumer Lending [Member]        
Interest income:        
Total interest income 295 362 614 767
Education Loan Portfolio [Member] | Adjustments [Member] | Reclassifications [Member]        
Interest income:        
Total interest income 24 13 48 16
Education Loan Portfolio [Member] | Adjustments [Member] | Additions (Subtractions) [Member]        
Interest income:        
Total interest income (10) (14) (20) (28)
Education Loan Portfolio [Member] | Adjustments [Member] | Total Adjustments [Member]        
Interest income:        
Total interest income $ 14 $ (1) $ 28 $ (12)