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Borrowings - Financing VIEs (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | $ 6,785 | $ 5,422
Long-term borrowings | 86,776 | 93,519
Total | 93,561 | 98,941
Total Before Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 6,762 | 5,425
Long-term borrowings | 86,840 | 93,868
Total | 93,602 | 99,293
Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 23 | (3)
Long-term borrowings | (64) | (349)
Total | (41) | (352)
Assets and Liabilities of Consolidated Variable Interest Entities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 4,904 | 4,341
Long-term borrowings | 77,373 | 82,738
Total | 82,277 | 87,079
Loans | 86,735 | 91,619
Cash | 2,640 | 3,928
Other assets, Net | 1,009 | 956
Total Carrying Amount of Assets Securing Debt Outstanding | 90,384 | 96,503
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan Securitizations [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 72 |
Long-term borrowings | 62,405 | 66,318
Total | 62,477 | 66,318
Loans | 63,494 | 66,266
Cash | 1,969 | 3,181
Other assets, Net | 1,316 | 1,211
Total Carrying Amount of Assets Securing Debt Outstanding | 66,779 | 70,658
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan Securitizations [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 1,867 | 300
Long-term borrowings | 12,541 | 12,985
Total | 14,408 | 13,285
Loans | 16,433 | 16,336
Cash | 541 | 536
Other assets, Net | 173 | 198
Total Carrying Amount of Assets Securing Debt Outstanding | 17,147 | 17,070
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan - Other Facilities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 2,270 | 2,927
Long-term borrowings | 1,836 | 2,625
Total | 4,106 | 5,552
Loans | 4,206 | 5,656
Cash | 66 | 132
Other assets, Net | 124 | 162
Total Carrying Amount of Assets Securing Debt Outstanding | 4,396 | 5,950
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan - Other Facilities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 695 | 1,114
Long-term borrowings | 1,053 | 1,266
Total | 1,748 | 2,380
Loans | 2,602 | 3,361
Cash | 64 | 79
Other assets, Net | 18 | 27
Total Carrying Amount of Assets Securing Debt Outstanding | 2,684 | 3,467
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Total Before Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 4,904 | 4,341
Long-term borrowings | 77,835 | 83,194
Total | 82,739 | 87,535
Loans | 86,735 | 91,619
Cash | 2,640 | 3,928
Other assets, Net | 1,631 | 1,598
Total Carrying Amount of Assets Securing Debt Outstanding | 91,006 | 97,145
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Long-term borrowings | (462) | (456)
Total | (462) | (456)
Other assets, Net | (622) | (642)
Total Carrying Amount of Assets Securing Debt Outstanding | $ (622) | $ (642)

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