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Borrowings - Company's Borrowings (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Short-term borrowings $ 2,637 $ 2,570
Long-term borrowings 116,540 124,833
Total 119,177 127,403
Total Before Hedge Accounting Adjustments [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 2,637 2,590
Long-term borrowings 116,291 124,916
Total 118,928 127,506
Total Before Hedge Accounting Adjustments [Member] | Senior Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 1,456 1,120
Long-term borrowings 13,038 13,976
Total 14,494 15,096
Total Before Hedge Accounting Adjustments [Member] | Total Unsecured Borrowings [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 1,456 1,120
Long-term borrowings 13,038 13,976
Total 14,494 15,096
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan Securitizations [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 74,269 77,764
Total 74,269 77,764
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan Securitizations [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 15,402 16,900
Total 15,402 16,900
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan - Other Facilities [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 13,582 16,276
Total 13,582 16,276
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan - Other Facilities [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 344 710
Total 344 710
Total Before Hedge Accounting Adjustments [Member] | Other [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 837 760
Total 837 760
Total Before Hedge Accounting Adjustments [Member] | Secured Borrowings [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 1,181 1,470
Long-term borrowings 103,253 110,940
Total 104,434 112,410
Hedge Accounting Adjustments [Member]    
Debt Instrument [Line Items]    
Short-term borrowings   (20)
Long-term borrowings 249 (83)
Total $ 249 $ (103)