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Allowance for Loan Losses - Private Education Loan Portfolio Stratified by Key Credit Quality Indicators (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]            
Loan allowance for losses $ (1,253) $ (1,274) $ (1,377) $ (1,400) $ (1,394) $ (1,112)
Private Education Loans [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year 20,701     22,560    
Loan allowance for losses (976) $ (992) (1,089) (1,098) $ (1,083) $ (1,048)
Loans, net 19,725   $ 21,079 21,462    
FICO Scores [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year 2021 2,728     2,036    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 2,526     3,871    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 2,322     1,395    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 859     456    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 267     97    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 11,999     14,705    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 20,701     $ 22,560    
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 2021 $ 2,713     $ 2,028    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 2,517     3,831    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 2,291     1,368    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 839     445    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 259     94    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 10,467     12,346    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 19,086     $ 20,112    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 92.00%     89.00%    
FICO Scores [Member] | Below 640 [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year 2021 $ 15     $ 8    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 9     40    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 31     27    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 20     11    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 8     3    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 1,532     2,359    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 1,615     $ 2,448    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 8.00%     11.00%    
Loan Status [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year 2021 $ 2,728     $ 2,036    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 2,526     3,871    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 2,322     1,395    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 859     456    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 267     97    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 11,999     14,705    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 20,701     $ 22,560    
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 2021 $ 12     $ 89    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 29     180    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 37     80    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 19     28    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 7     8    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 905     1,974    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 1,009     $ 2,359    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 5.00%     10.00%    
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 2021 $ 2,716     $ 1,947    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 2,496     3,690    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 2,283     1,313    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 839     427    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 259     89    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 10,906     12,525    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 19,499     $ 19,991    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 94.00%     89.00%    
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 2020 $ 1     $ 1    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 2     2    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 1     1    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 1          
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 188     206    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 193     $ 210    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 1.00%     1.00%    
School Type [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year 2021 $ 2,728     $ 2,036    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 2,526     3,871    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 2,322     1,395    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 859     456    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 267     97    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 11,999     14,705    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 20,701     $ 22,560    
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 2021 $ 2,583     $ 1,918    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 2,412     3,618    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 2,166     1,292    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 792     436    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 256     96    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 9,960     12,155    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 18,169     $ 19,515    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 88.00%     86.00%    
School Type [Member] | For Profit [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year 2021 $ 145     $ 118    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 114     253    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 156     103    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 67     20    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 11     1    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 2,039     2,550    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 2,532     $ 3,045    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 12.00%     14.00%    
Cosigners [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year 2021 $ 2,728     $ 2,036    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 2,526     3,871    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 2,322     1,395    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 859     456    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 267     97    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 11,999     14,705    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 20,701     $ 22,560    
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 2021 $ 8     $ 2    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 36     14    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 13     1    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 1     58    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 39     26    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 7,883     9,641    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 7,980     $ 9,742    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 39.00%     43.00%    
Cosigners [Member] | Without Cosigner [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year 2021 $ 2,720     $ 2,034    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 2,490     3,857    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 2,309     1,394    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 858     398    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 228     71    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 4,116     5,064    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 12,721     $ 12,818    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 61.00%     57.00%    
Private Education Loans Troubled Debt Restructuring Status            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year 2021 $ 2,728     $ 2,036    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 2,526     3,871    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 2,322     1,395    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 859     456    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 267     97    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 11,999     14,705    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 20,701     $ 22,560    
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 2020 $ 3     $ 5    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 20     21    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 26     31    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 30     12    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 7,504     8,679    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 7,583     $ 8,748    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 37.00%     39.00%    
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 2021 $ 2,728     $ 2,036    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 2,523     3,866    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 2,302     1,374    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 833     425    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 237     85    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 4,495     6,026    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 13,118     $ 13,812    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 63.00%     61.00%    
Seasoning [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year 2021 $ 2,728     $ 2,036    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 2,526     3,871    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 2,322     1,395    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 859     456    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 267     97    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 11,999     14,705    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 20,701     $ 22,560    
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 2021 $ 2,720     $ 2,032    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 1,497     3,203    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 50     14    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 6     2    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 2          
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 152     214    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 4,427     $ 5,465    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 22.00%     24.00%    
Seasoning [Member] | 13-24 Payments [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 $ 1,010     $ 651    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 1,869     1,017    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 27     14    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 4     2    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 181     283    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 3,091     $ 1,967    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 15.00%     9.00%    
Seasoning [Member] | 25-36 Payments [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 $ 381     $ 352    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 621     350    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 16     6    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 297     465    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 1,315     $ 1,173    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 6.00%     5.00%    
Seasoning [Member] | 37-48 Payments [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 $ 195     $ 86    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 197     86    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 463     698    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 855     $ 870    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 4.00%     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 2017 $ 46     $ 2    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 10,564     12,571    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 10,610     $ 12,573    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 51.00%     56.00%    
Seasoning [Member] | School/Grace/Deferment [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Private Education Loan Credit Quality Indicators by Origination Year 2021 $ 8     $ 4    
Total Private Education Loan Credit Quality Indicators by Origination Year 2020 19     17    
Total Private Education Loan Credit Quality Indicators by Origination Year 2019 22     12    
Total Private Education Loan Credit Quality Indicators by Origination Year 2018 10     4    
Total Private Education Loan Credit Quality Indicators by Origination Year 2017 2     1    
Total Private Education Loan Credit Quality Indicators by Origination Year Prior 342     474    
Total Private Education Loan Credit Quality Indicators by Origination Year $ 403     $ 512    
Total Private Education Loan Credit Quality Indicators by Origination Year, Percent 2.00%     2.00%