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Borrowings - Company's Borrowings (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-term borrowings, Carrying Value | $ 4,226 | $ 5,870
Short-term Weighted Average Interest Rate | 6.67% | 5.78%
Long-term borrowings, Carrying Value | $ 53,402 | $ 61,026
Long-term Weighted Average Interest Rate | 5.62% | 4.70%
Total | $ 57,628 | $ 66,896
FFELP Loan ABCP Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Total | 1,900 |
Private Education Loan ABCP Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Total | 2,100 |
Total Before Hedge Accounting Adjustments [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings, Carrying Value | $ 4,235 | $ 5,880
Short-term Weighted Average Interest Rate | 6.66% | 5.78%
Long-term borrowings, Carrying Value | $ 53,680 | $ 61,516
Long-term Weighted Average Interest Rate | 5.59% | 4.66%
Total | $ 57,915 | $ 67,396
Total Before Hedge Accounting Adjustments [Member] | Senior Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings, Carrying Value | $ 506 | $ 1,301
Short-term Weighted Average Interest Rate | 5.88% | 5.90%
Long-term borrowings, Carrying Value | $ 5,351 | $ 5,711
Long-term Weighted Average Interest Rate | 6.61% | 5.82%
Total | $ 5,857 | $ 7,012
Total Before Hedge Accounting Adjustments [Member] | Total Unsecured Borrowings [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings, Carrying Value | $ 506 | $ 1,301
Short-term Weighted Average Interest Rate | 5.88% | 5.90%
Long-term borrowings, Carrying Value | $ 5,351 | $ 5,711
Long-term Weighted Average Interest Rate | 6.61% | 5.82%
Total | $ 5,857 | $ 7,012
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan Securitizations [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings, Carrying Value | $ 59 | $ 76
Short-term Weighted Average Interest Rate | 6.84% | 6.01%
Long-term borrowings, Carrying Value | $ 35,626 | $ 42,675
Long-term Weighted Average Interest Rate | 6.06% | 4.96%
Total | $ 35,685 | $ 42,751
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan Securitizations [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings, Carrying Value | $ 435 | $ 725
Short-term Weighted Average Interest Rate | 8.14% | 7.17%
Long-term borrowings, Carrying Value | $ 11,754 | $ 12,744
Long-term Weighted Average Interest Rate | 3.59% | 3.11%
Total | $ 12,189 | $ 13,469
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan ABCP Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings, Carrying Value | $ 1,854 | $ 923
Short-term Weighted Average Interest Rate | 6.60% | 5.31%
Long-term borrowings, Carrying Value | $ 89 | $ 386
Long-term Weighted Average Interest Rate | 6.29% | 5.33%
Total | $ 1,943 | $ 1,309
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan ABCP Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings, Carrying Value | $ 1,286 | $ 2,734
Short-term Weighted Average Interest Rate | 6.62% | 5.55%
Long-term borrowings, Carrying Value | $ 821 | $ 0
Long-term Weighted Average Interest Rate | 6.84% | 0.00%
Total | $ 2,107 | $ 2,734
Total Before Hedge Accounting Adjustments [Member] | Other [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings, Carrying Value | $ 95 | $ 121
Short-term Weighted Average Interest Rate | 5.61% | 4.61%
Long-term borrowings, Carrying Value | $ 39 | $ 0
Long-term Weighted Average Interest Rate | 5.50% | 0.00%
Total | $ 134 | $ 121
Total Before Hedge Accounting Adjustments [Member] | Secured Borrowings [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings, Carrying Value | $ 3,729 | $ 4,579
Short-term Weighted Average Interest Rate | 6.76% | 5.74%
Long-term borrowings, Carrying Value | $ 48,329 | $ 55,805
Long-term Weighted Average Interest Rate | 5.47% | 4.54%
Total | $ 52,058 | $ 60,384
Hedge Accounting Adjustments [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings, Carrying Value | $ (9) | $ (10)
Short-term Weighted Average Interest Rate | 0.01% | 0.01%
Long-term borrowings, Carrying Value | $ (278) | $ (490)
Long-term Weighted Average Interest Rate | 0.03% | 0.04%
Total | $ (287) | $ (500)

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