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Allowance for Loan Losses - Private Education Loan Portfolio Stratified by Key Credit Quality Indicators (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]            
Loan allowance for losses $ (530) $ (579) $ (621) $ (687) $ (744) $ (832)
Private Education Loans [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Loans, gross 15,878     16,731    
Loan allowance for losses (348) $ (397) (441) (493) $ (538) $ (617)
Loans, net 15,530   $ 15,716 16,238    
Loan, Net Charge-Offs in Year One 0     0    
Loan, Net Charge-Offs in Year Two (2)     (1)    
Loan, Net Charge-Offs in Year Three (3)     (5)    
Loan, Net Charge-Offs in Year Four (6)     (9)    
Loan, Net Charge-Offs in Year Five (12)     (2)    
Loan, Net Charge-Offs in Year Prior (129)     (149)    
Total Net Charge-Offs (152)     (166)    
FICO Scores [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One 954     498    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 1,194     861    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 681     1,528    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,269     3,728    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 3,157     1,150    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 8,623     8,966    
Total Loans, gross $ 15,878     $ 16,731    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 100.00%     100.00%    
FICO Scores [Member] | 640 and Above [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 940     $ 490    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 1,146     841    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 635     1,453    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,167     3,591    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 2,991     1,119    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 7,020     7,513    
Total Loans, gross $ 13,899     $ 15,007    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 88.00%     90.00%    
FICO Scores [Member] | Below 640 [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 14     $ 8    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 48     20    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 46     75    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 102     137    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 166     31    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 1,603     1,453    
Total Loans, gross $ 1,979     $ 1,724    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 12.00%     10.00%    
Loan Status [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 954     $ 498    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 1,194     861    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 681     1,528    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,269     3,728    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 3,157     1,150    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 8,623     8,966    
Total Loans, gross $ 15,878     $ 16,731    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 100.00%     100.00%    
Loan Status [Member] | In-school/Grace/Deferment/Forbearance [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 29     $ 22    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 91     69    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 55     64    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 51     80    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 73     19    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 312     390    
Total Loans, gross $ 611     $ 644    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 4.00%     4.00%    
Loan Status [Member] | Current/90 Days or Less Delinquent [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 924     $ 476    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 1,097     789    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 618     1,454    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,201     3,634    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 3,063     1,127    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 7,905     8,256    
Total Loans, gross $ 14,808     $ 15,736    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 93.00%     94.00%    
Loan Status [Member] | Greater than 90 days Delinquent [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 1     $ 0    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 6     3    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 8     10    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 17     14    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 21     4    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 406     320    
Total Loans, gross $ 459     $ 351    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 3.00%     2.00%    
Certain Loan Modifications [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 954     $ 498    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 1,194     861    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 681     1,528    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,269     3,728    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 3,157     1,150    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 8,623     8,966    
Total Loans, gross $ 15,878     $ 16,731    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 100.00%     100.00%    
Certain Loan Modifications [Member] | Modified [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 0     $ 0    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 6     3    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 27     64    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 98     161    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 203     53    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 5,077     5,538    
Total Loans, gross $ 5,411     $ 5,819    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 34.00%     35.00%    
Certain Loan Modifications [Member] | Non-Modified [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 954     $ 498    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 1,188     858    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 654     1,464    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,171     3,567    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 2,954     1,097    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 3,546     3,428    
Total Loans, gross $ 10,467     $ 10,912    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 66.00%     65.00%    
Cosigners [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 954     $ 498    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 1,194     861    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 681     1,528    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,269     3,728    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 3,157     1,150    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 8,623     8,966    
Total Loans, gross $ 15,878     $ 16,731    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 100.00%     100.00%    
Cosigners [Member] | With Cosigner [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 152     $ 76    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 342     264    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 225     168    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 136     87    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 70     21    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 4,179     4,808    
Total Loans, gross $ 5,104     $ 5,424    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 32.00%     32.00%    
Cosigners [Member] | Without Cosigner [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 802     $ 422    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 852     597    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 456     1,360    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,133     3,641    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 3,087     1,129    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 4,444     4,158    
Total Loans, gross $ 10,774     $ 11,307    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 68.00%     68.00%    
School Type [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 954     $ 498    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 1,194     861    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 681     1,528    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,269     3,728    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 3,157     1,150    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 8,623     8,966    
Total Loans, gross $ 15,878     $ 16,731    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 100.00%     100.00%    
School Type [Member] | Not For Profit [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 893     $ 335    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 1,127     814    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 643     1,447    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,201     3,511    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 2,971     1,099    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 7,489     7,674    
Total Loans, gross $ 14,324     $ 14,880    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 90.00%     89.00%    
School Type [Member] | For Profit [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 61     $ 163    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 67     47    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 38     81    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 68     217    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 186     51    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 1,134     1,292    
Total Loans, gross $ 1,554     $ 1,851    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 10.00%     11.00%    
Repayments [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 954     $ 498    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 1,194     861    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 681     1,528    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,269     3,728    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 3,157     1,150    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 8,623     8,966    
Total Loans, gross $ 15,878     $ 16,731    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 100.00%     100.00%    
Repayments [Member] | 1-12 Payments [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 932     $ 479    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 879     632    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 28     36    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 22     24    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 11     3    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 30     45    
Total Loans, gross $ 1,902     $ 1,219    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 12.00%     7.00%    
Repayments [Member] | 13-24 Payments [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 0     $ 0    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 238     172    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 484     656    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 48     82    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 37     11    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 41     61    
Total Loans, gross $ 848     $ 982    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 6.00%     6.00%    
Repayments [Member] | 25-36 Payments [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 0     $ 0    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 0     0    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 125     791    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 524     2,602    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 107     28    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 85     111    
Total Loans, gross $ 841     $ 3,532    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 5.00%     21.00%    
Repayments [Member] | 37-48 Payments [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 0     $ 0    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 0     0    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 0     0    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 645     976    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 2,182     683    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 160     206    
Total Loans, gross $ 2,987     $ 1,865    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 19.00%     11.00%    
Repayments [Member] | More than 48 Payments [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 0     $ 0    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 0     0    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 0     0    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 0     0    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 784     416    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 8,155     8,367    
Total Loans, gross $ 8,939     $ 8,783    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 56.00%     53.00%    
Repayments [Member] | School/Grace/Deferment [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 22     $ 19    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 77     57    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 44     45    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 30     44    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 36     9    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 152     176    
Total Loans, gross $ 361     $ 350    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 2.00%     2.00%