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Borrowings - Financing VIEs (Detail) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | $ 2,160 | $ 2,334
Long-term borrowings | 109,586 | 112,368
Total Debt Outstanding | 111,746 | 114,702
Total Before Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 2,161 | 2,335
Long-term borrowings | 110,223 | 113,119
Total Debt Outstanding | 112,384 | 115,454
Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | (1) | (1)
Long-term borrowings | (637) | (751)
Total Debt Outstanding | (638) | (752)
Assets and Liabilities of Consolidated Variable Interest Entities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 1,177 | 1,078
Long-term borrowings | 92,559 | 95,492
Total Debt Outstanding | 93,736 | 96,570
Loans | 100,883 | 104,008
Cash | 3,556 | 3,434
Other assets, Net | 95 | (11)
Total Carrying Amount of Assets Securing Debt Outstanding | 104,534 | 107,431
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan Securitizations [Member] |  |
Securities Financing Transaction [Line Items] |  |
Long-term borrowings | 73,047 | 73,522
Total Debt Outstanding | 73,047 | 73,522
Loans | 73,669 | 74,197
Cash | 2,764 | 2,676
Other assets, Net | 818 | 778
Total Carrying Amount of Assets Securing Debt Outstanding | 77,251 | 77,651
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan Securitizations [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 548 | 548
Long-term borrowings | 13,343 | 14,125
Total Debt Outstanding | 13,891 | 14,673
Loans | 19,030 | 19,815
Cash | 490 | 455
Other assets, Net | 243 | 260
Total Carrying Amount of Assets Securing Debt Outstanding | 19,763 | 20,530
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan - Other Facilities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Long-term borrowings | 7,208 | 9,046
Total Debt Outstanding | 7,208 | 9,046
Loans | 7,295 | 9,232
Cash | 279 | 289
Other assets, Net | 158 | 172
Total Carrying Amount of Assets Securing Debt Outstanding | 7,732 | 9,693
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan - Other Facilities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 540 | 464
Total Debt Outstanding | 540 | 464
Loans | 785 | 685
Cash | 17 | 10
Other assets, Net | 13 | 14
Total Carrying Amount of Assets Securing Debt Outstanding | 815 | 709
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Total Before Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 1,177 | 1,078
Long-term borrowings | 93,598 | 96,693
Total Debt Outstanding | 94,775 | 97,771
Loans | 100,883 | 104,008
Cash | 3,556 | 3,434
Other assets, Net | 1,231 | 1,224
Total Carrying Amount of Assets Securing Debt Outstanding | 105,670 | 108,666
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Long-term borrowings | (1,039) | (1,201)
Total Debt Outstanding | (1,039) | (1,201)
Other assets, Net | (1,136) | (1,235)
Total Carrying Amount of Assets Securing Debt Outstanding | (1,136) | (1,235)
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Other [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 89 | 66
Total Debt Outstanding | 89 | 66
Loans | 104 | 79
Cash | 6 | 4
Other assets, Net | (1) |
Total Carrying Amount of Assets Securing Debt Outstanding | $ 109 | $ 83

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