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Allowance for Loan Losses - Private Education Loan Portfolio Stratified by Key Credit Quality Indicators (Detail) - USD ($)
$ in Millions
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]            
Loan allowance for losses $ (1,085) $ (1,166) $ (1,271) $ (1,249) $ (1,253) $ (1,377)
Private Education Loans [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year 20,003     20,998    
Loan allowance for losses (852) $ (921) (1,009) (980) $ (976) $ (1,089)
Loans, net 19,151   $ 20,171 20,018    
FICO Scores [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One 1,520     4,077    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 4,772     2,238    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 1,612     2,097    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,539     782    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 576     241    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 9,984     11,563    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 20,003     $ 20,998    
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 $ 1,503     $ 4,049    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 4,708     2,228    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 1,593     2,064    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,502     762    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 556     233    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 8,485     10,021    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 18,347     $ 19,357    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 92.00%     92.00%    
FICO Scores [Member] | Below 640 [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 17     $ 28    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 64     10    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 19     33    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 37     20    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 20     8    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 1,499     1,542    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 1,656     $ 1,641    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 8.00%     8.00%    
Loan Status [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 1,520     $ 4,077    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 4,772     2,238    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 1,612     2,097    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,539     782    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 576     241    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 9,984     11,563    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 20,003     $ 20,998    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 100.00%     100.00%    
Loan Status [Member] | School/Grace/Deferment [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 31     $ 32    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 88     34    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 28     45    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 34     19    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 13     8    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 525     1,065    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 719     $ 1,203    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 4.00%     6.00%    
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 $ 1,488     $ 4,044    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 4,678     2,203    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 1,582     2,049    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,499     762    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 560     232    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 9,083     10,289    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 18,890     $ 19,579    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 94.00%     93.00%    
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     $ 1    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 6     1    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 2     3    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 6     1    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 3     1    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 376     209    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 394     $ 216    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 2.00%     1.00%    
School Type [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 1,520     $ 4,077    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 4,772     2,238    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 1,612     2,097    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,539     782    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 576     241    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 9,984     11,563    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 20,003     $ 20,998    
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 $ 1,427     $ 3,850    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 4,496     2,137    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 1,541     1,957    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,434     721    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 529     231    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 8,338     9,607    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 17,765     $ 18,503    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 89.00%     88.00%    
School Type [Member] | For Profit [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 93     $ 227    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 276     101    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 71     140    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 105     61    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 47     10    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 1,646     1,956    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 2,238     $ 2,495    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 11.00%     12.00%    
Cosigners [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 1,520     $ 4,077    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 4,772     2,238    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 1,612     2,097    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,539     782    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 576     241    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 9,984     11,563    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 20,003     $ 20,998    
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 $ 24     $ 12    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 109     34    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 28     13    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 11          
Total Private Education Loan Credit Quality Indicators by Origination Year Five       37    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 6,425     7,560    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 6,597     $ 7,656    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 33.00%     36.00%    
Cosigners [Member] | Without Cosigner [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 1,496     $ 4,065    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 4,663     2,204    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 1,584     2,084    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,528     782    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 576     204    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 3,559     4,003    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 13,406     $ 13,342    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 67.00%     64.00%    
Private Education Loans Troubled Debt Restructuring Status            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 1,520     $ 4,077    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 4,772     2,238    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 1,612     2,097    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,539     782    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 576     241    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 9,984     11,563    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 20,003     $ 20,998    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 100.00%     100.00%    
Private Education Loans Troubled Debt Restructuring Status | Private Education Loans - TDRs [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 6     $ 1    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 48     5    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 28     26    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 62     27    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 35     30    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 6,617     7,323    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 6,796     $ 7,412    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 34.00%     35.00%    
Private Education Loans Troubled Debt Restructuring Status | Private Education Loans - Non-TDRs [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 1,514     $ 4,076    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 4,724     2,233    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 1,584     2,071    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,477     755    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 541     211    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 3,367     4,240    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 13,207     $ 13,586    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 66.00%     65.00%    
Seasoning [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 1,520     $ 4,077    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 4,772     2,238    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 1,612     2,097    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 1,539     782    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 576     241    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 9,984     11,563    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 20,003     $ 20,998    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 100.00%     100.00%    
Seasoning [Member] | 1-12 Payments [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 1,499     $ 4,058    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 2,186     1,017    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 14     37    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 10     5    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 2     1    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 95     142    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 3,806     $ 5,260    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 19.00%     25.00%    
Seasoning [Member] | 13-24 Payments [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year Two $ 2,534     $ 1,201    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 736     1,330    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 39     20    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 8     4    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 102     167    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 3,419     $ 2,722    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 17.00%     13.00%    
Seasoning [Member] | 25-36 Payments [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year Three $ 846     $ 709    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 968     385    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 19     12    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 177     273    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 2,010     $ 1,379    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 10.00%     7.00%    
Seasoning [Member] | 37-48 Payments [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year Four $ 503     $ 364    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 287     133    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 293     417    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 1,083     $ 914    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 5.00%     4.00%    
Seasoning [Member] | More than 48 Payments [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year Five $ 254     $ 89    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 9,083     10,245    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 9,337     $ 10,334    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 47.00%     49.00%    
Seasoning [Member] | School/Grace/Deferment [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year One $ 21     $ 19    
Total Private Education Loan Credit Quality Indicators by Origination Year Two 52     20    
Total Private Education Loan Credit Quality Indicators by Origination Year Three 16     21    
Total Private Education Loan Credit Quality Indicators by Origination Year Four 19     8    
Total Private Education Loan Credit Quality Indicators by Origination Year Five 6     2    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 234     319    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 348     $ 389    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 2.00%     2.00%