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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)

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