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Borrowings - Financing VIEs (Detail) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | $ 2,370 | $ 2,570
Long-term borrowings | 119,637 | 124,833
Total Debt Outstanding | 122,007 | 127,403
Other assets | 4,782 | 4,682
Total Before Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 2,393 | 2,590
Long-term borrowings | 119,276 | 124,916
Total Debt Outstanding | 121,669 | 127,506
Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | (23) | (20)
Long-term borrowings | 361 | (83)
Total Debt Outstanding | 338 | (103)
Assets and Liabilities of Consolidated Variable Interest Entities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 361 | 710
Long-term borrowings | 102,103 | 106,510
Total Debt Outstanding | 102,464 | 107,220
Loans | 109,360 | 114,640
Cash | 3,419 | 3,553
Other assets | 432 | 293
Total Carrying Amount of Assets Securing Debt Outstanding | 113,211 | 118,486
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan Securitizations [Member] |  |
Securities Financing Transaction [Line Items] |  |
Long-term borrowings | 75,698 | 77,764
Total Debt Outstanding | 75,698 | 77,764
Loans | 76,330 | 78,358
Cash | 2,649 | 2,760
Other assets | 754 | 682
Total Carrying Amount of Assets Securing Debt Outstanding | 79,733 | 81,800
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan Securitizations [Member] |  |
Securities Financing Transaction [Line Items] |  |
Long-term borrowings | 16,168 | 16,900
Total Debt Outstanding | 16,168 | 16,900
Loans | 21,213 | 22,014
Cash | 477 | 452
Other assets | 284 | 323
Total Carrying Amount of Assets Securing Debt Outstanding | 21,974 | 22,789
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan - Other Facilities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Long-term borrowings | 11,009 | 12,676
Total Debt Outstanding | 11,009 | 12,676
Loans | 11,283 | 13,158
Cash | 285 | 324
Other assets | 171 | 168
Total Carrying Amount of Assets Securing Debt Outstanding | 11,739 | 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 | 361 | 710
Total Debt Outstanding | 361 | 710
Loans | 534 | 1,110
Cash | 8 | 17
Other assets | 16 | 31
Total Carrying Amount of Assets Securing Debt Outstanding | 558 | 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 | 361 | 710
Long-term borrowings | 102,875 | 107,340
Total Debt Outstanding | 103,236 | 108,050
Loans | 109,360 | 114,640
Cash | 3,419 | 3,553
Other assets | 1,225 | 1,204
Total Carrying Amount of Assets Securing Debt Outstanding | 114,004 | 119,397
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Long-term borrowings | (772) | (830)
Total Debt Outstanding | (772) | (830)
Other assets | (793) | (911)
Total Carrying Amount of Assets Securing Debt Outstanding | $ (793) | $ (911)

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