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Borrowings - Financing VIEs (Detail) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | $ 2,637 | $ 2,570
Long-term borrowings | 116,540 | 124,833
Total Debt Outstanding | 119,177 | 127,403
Other assets | 4,591 | 4,682
Total Before Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 2,637 | 2,590
Long-term borrowings | 116,291 | 124,916
Total Debt Outstanding | 118,928 | 127,506
Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings |  | (20)
Long-term borrowings | 249 | (83)
Total Debt Outstanding | 249 | (103)
Assets and Liabilities of Consolidated Variable Interest Entities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 381 | 710
Long-term borrowings | 99,027 | 106,510
Total Debt Outstanding | 99,408 | 107,220
Loans | 106,150 | 114,640
Cash | 3,437 | 3,553
Other assets | 553 | 293
Total Carrying Amount of Assets Securing Debt Outstanding | 110,140 | 118,486
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan Securitizations [Member] |  |
Securities Financing Transaction [Line Items] |  |
Long-term borrowings | 74,269 | 77,764
Total Debt Outstanding | 74,269 | 77,764
Loans | 74,813 | 78,358
Cash | 2,723 | 2,760
Other assets | 784 | 682
Total Carrying Amount of Assets Securing Debt Outstanding | 78,320 | 81,800
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan Securitizations [Member] |  |
Securities Financing Transaction [Line Items] |  |
Long-term borrowings | 15,402 | 16,900
Total Debt Outstanding | 15,402 | 16,900
Loans | 20,505 | 22,014
Cash | 447 | 452
Other assets | 282 | 323
Total Carrying Amount of Assets Securing Debt Outstanding | 21,234 | 22,789
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan - Other Facilities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Long-term borrowings | 10,071 | 12,676
Total Debt Outstanding | 10,071 | 12,676
Loans | 10,266 | 13,158
Cash | 258 | 324
Other assets | 172 | 168
Total Carrying Amount of Assets Securing Debt Outstanding | 10,696 | 13,650
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan - Other Facilities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 344 | 710
Total Debt Outstanding | 344 | 710
Loans | 520 | 1,110
Cash | 8 | 17
Other assets | 16 | 31
Total Carrying Amount of Assets Securing Debt Outstanding | 544 | 1,158
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Total Before Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 381 | 710
Long-term borrowings | 99,742 | 107,340
Total Debt Outstanding | 100,123 | 108,050
Loans | 106,150 | 114,640
Cash | 3,437 | 3,553
Other assets | 1,253 | 1,204
Total Carrying Amount of Assets Securing Debt Outstanding | 110,840 | 119,397
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Long-term borrowings | (715) | (830)
Total Debt Outstanding | (715) | (830)
Other assets | (700) | (911)
Total Carrying Amount of Assets Securing Debt Outstanding | (700) | $ (911)
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Other [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 37 |
Total Debt Outstanding | 37 |
Loans | 46 |
Cash | 1 |
Other assets | (1) |
Total Carrying Amount of Assets Securing Debt Outstanding | $ 46 |

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