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Borrowings - Company's Borrowings (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Short-term borrowings $ 2,160 $ 2,334
Long-term borrowings 109,586 112,368
Total 111,746 114,702
Total Before Hedge Accounting Adjustments [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 2,161 2,335
Long-term borrowings 110,223 113,119
Total 112,384 115,454
Total Before Hedge Accounting Adjustments [Member] | Senior Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 571 717
Long-term borrowings 13,424 13,029
Total 13,995 13,746
Total Before Hedge Accounting Adjustments [Member] | Total Unsecured Borrowings [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 571 717
Long-term borrowings 13,424 13,029
Total 13,995 13,746
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan Securitizations [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 73,047 73,522
Total 73,047 73,522
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan Securitizations [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 548 548
Long-term borrowings 13,343 14,125
Total 13,891 14,673
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan - Other Facilities [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 10,409 12,443
Total 10,409 12,443
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan - Other Facilities [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 540 464
Total 540 464
Total Before Hedge Accounting Adjustments [Member] | Other [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 502 606
Total 502 606
Total Before Hedge Accounting Adjustments [Member] | Secured Borrowings [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 1,590 1,618
Long-term borrowings 96,799 100,090
Total 98,389 101,708
Hedge Accounting Adjustments [Member]    
Debt Instrument [Line Items]    
Short-term borrowings (1) (1)
Long-term borrowings (637) (751)
Total $ (638) $ (752)