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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)

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