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Borrowings - Financing VIEs (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Short-term borrowings, Carrying Value | $ 4,226 | $ 5,870
Long-term borrowings, Carrying Value | 53,402 | 61,026
Total | 57,628 | 66,896
Ending Balance of education loans | 54,827 | 62,250
Total assets | 61,375 | 70,795
Total Before Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings, Carrying Value | 4,235 | 5,880
Long-term borrowings, Carrying Value | 53,680 | 61,516
Total | 57,915 | 67,396
Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings, Carrying Value | (9) | (10)
Long-term borrowings, Carrying Value | (278) | (490)
Total | (287) | (500)
Assets and Liabilities of Consolidated Variable Interest Entities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings, Carrying Value | 3,634 | 4,458
Long-term borrowings, Carrying Value | 48,169 | 55,598
Total | 51,803 | 60,056
Ending Balance of education loans | 53,591 | 60,672
Cash | 1,937 | 3,233
Other assets, Net | 1,744 | 1,356
Total assets | 57,272 | 65,261
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan Securitizations [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings, Carrying Value | 59 | 76
Long-term borrowings, Carrying Value | 35,626 | 42,675
Total | 35,685 | 42,751
Ending Balance of education loans | 35,935 | 42,148
Cash | 1,441 | 2,705
Other assets, Net | 1,673 | 1,544
Total assets | 39,049 | 46,397
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan Securitizations [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings, Carrying Value | 435 | 725
Long-term borrowings, Carrying Value | 11,754 | 12,744
Total | 12,189 | 13,469
Ending Balance of education loans | 13,396 | 14,168
Cash | 350 | 367
Other assets, Net | 119 | 105
Total assets | 13,865 | 14,640
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan ABCP Facilities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings, Carrying Value | 1,854 | 923
Long-term borrowings, Carrying Value | 89 | 386
Total | 1,943 | 1,309
Ending Balance of education loans | 1,897 | 1,317
Cash | 77 | 39
Other assets, Net | 92 | 44
Total assets | 2,066 | 1,400
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan ABCP Facilities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings, Carrying Value | 1,286 | 2,734
Long-term borrowings, Carrying Value | 821 | 0
Total | 2,107 | 2,734
Ending Balance of education loans | 2,363 | 3,039
Cash | 69 | 122
Other assets, Net | 50 | (81)
Total assets | 2,482 | 3,080
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Total Before Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings, Carrying Value | 3,634 | 4,458
Long-term borrowings, Carrying Value | 48,290 | 55,805
Total | 51,924 | 60,263
Ending Balance of education loans | 53,591 | 60,672
Cash | 1,937 | 3,233
Other assets, Net | 1,934 | 1,612
Total assets | 57,462 | 65,517
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings, Carrying Value | 0 | 0
Long-term borrowings, Carrying Value | (121) | (207)
Total | (121) | (207)
Ending Balance of education loans | 0 | 0
Cash | 0 | 0
Other assets, Net | (190) | (256)
Total assets | $ (190) | $ (256)

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