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Borrowings - Company's Borrowings (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [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] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 6,762 | 5,425
Long-term borrowings | 86,840 | 93,868
Total | 93,602 | 99,293
Total Before Hedge Accounting Adjustments [Member] | Senior Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 1,496 | 817
Long-term borrowings | 9,005 | 10,674
Total | 10,501 | 11,491
Total Before Hedge Accounting Adjustments [Member] | Total Unsecured Borrowings [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 1,496 | 817
Long-term borrowings | 9,005 | 10,674
Total | 10,501 | 11,491
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan Securitizations [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 72 |
Long-term borrowings | 62,405 | 66,318
Total | 62,477 | 66,318
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan Securitizations [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 1,867 | 300
Long-term borrowings | 12,541 | 12,985
Total | 14,408 | 13,285
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan - Other Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 2,270 | 2,927
Long-term borrowings | 1,836 | 2,625
Total | 4,106 | 5,552
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan - Other Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 695 | 1,114
Long-term borrowings | 1,053 | 1,266
Total | 1,748 | 2,380
Total Before Hedge Accounting Adjustments [Member] | Other [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 362 | 267
Total | 362 | 267
Total Before Hedge Accounting Adjustments [Member] | Secured Borrowings [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 5,266 | 4,608
Long-term borrowings | 77,835 | 83,194
Total | 83,101 | 87,802
Hedge Accounting Adjustments [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 23 | (3)
Long-term borrowings | (64) | (349)
Total | $ (41) | $ (352)

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