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Borrowings - Company's Borrowings (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Short-term borrowings $ 2,370 $ 2,570
Long-term borrowings 119,637 124,833
Total 122,007 127,403
Total Before Hedge Accounting Adjustments [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 2,393 2,590
Long-term borrowings 119,276 124,916
Total 121,669 127,506
Total Before Hedge Accounting Adjustments [Member] | Senior Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 1,077 1,120
Long-term borrowings 12,801 13,976
Total 13,878 15,096
Total Before Hedge Accounting Adjustments [Member] | Total Unsecured Borrowings [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 1,077 1,120
Long-term borrowings 12,801 13,976
Total 13,878 15,096
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan Securitizations [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 75,698 77,764
Total 75,698 77,764
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan Securitizations [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 16,168 16,900
Total 16,168 16,900
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan - Other Facilities [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 14,609 16,276
Total 14,609 16,276
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan - Other Facilities [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 361 710
Total 361 710
Total Before Hedge Accounting Adjustments [Member] | Other [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 955 760
Total 955 760
Total Before Hedge Accounting Adjustments [Member] | Secured Borrowings [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 1,316 1,470
Long-term borrowings 106,475 110,940
Total 107,791 112,410
Hedge Accounting Adjustments [Member]    
Debt Instrument [Line Items]    
Short-term borrowings (23) (20)
Long-term borrowings 361 (83)
Total $ 338 $ (103)