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Borrowings - Company's Borrowings (Parenthetical) (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 75,814 | $ 77,332
Short-term Debt | 4,068 | 6,613
Total Before Hedge Accounting Adjustments [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 75,340 | 76,781
Short-term Debt | 4,038 | 6,609
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan Asset-backed Securitization Repurchase Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 155 | 157
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan Asset-backed Securitization Repurchase Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 0 | 260
Short-term Debt | 832 | 960
Total Before Hedge Accounting Adjustments [Member] | Short Term Senior Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt principal amount | 1,700 | 678
Total Before Hedge Accounting Adjustments [Member] | Long Term Senior Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt principal amount | $ 6,500 | $ 7,800

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