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Borrowings - Financing VIEs (Parenthetical) (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Short-term Debt | $ 6,785 | $ 5,422
Long-term debt | 86,776 | 93,519
Assets and Liabilities of Consolidated Variable Interest Entities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term Debt | 4,904 | 4,341
Long-term debt | 77,373 | 82,738
Restricted cash | 2,640 | 3,928
FFELP Loan Securitizations Repurchase Facilities [Member] | Assets and Liabilities of Consolidated Variable Interest Entities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term Debt | 72 |
Long-term debt | 214 | 244
Restricted cash | 9 | 9
Private Education Loan Securitizations Repurchase Facilities [Member] | Assets and Liabilities of Consolidated Variable Interest Entities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term Debt | 1,900 | 300
Long-term debt | 921 | 2,000
Restricted cash | $ 65 | $ 115

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