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Borrowings - Financing VIEs (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | $ 4,068 | $ 6,613
Long-term borrowings | 75,814 | 77,332
Total | 79,882 | 83,945
Total assets | 83,348 | 87,412
Total Before Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 4,038 | 6,609
Long-term borrowings | 75,340 | 76,781
Total | 79,378 | 83,390
Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 30 | 4
Long-term borrowings | 474 | 551
Total | 504 | 555
Assets and Liabilities of Consolidated Variable Interest Entities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 2,026 | 5,595
Long-term borrowings | 68,850 | 68,900
Total | 70,876 | 74,495
Loans | 72,552 | 76,726
Cash | 2,275 | 2,322
Other assets, Net | 1,579 | 1,420
Total assets | 76,406 | 80,468
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan Securitizations [Member] |  |
Securities Financing Transaction [Line Items] |  |
Long-term borrowings | 54,000 | 54,697
Total | 54,000 | 54,697
Loans | 54,773 | 55,535
Cash | 1,641 | 1,606
Other assets, Net | 1,479 | 1,438
Total assets | 57,893 | 58,579
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan Securitizations [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 832 | 960
Long-term borrowings | 13,154 | 13,891
Total | 13,986 | 14,851
Loans | 14,830 | 15,823
Cash | 551 | 606
Other assets, Net | 172 | 187
Total assets | 15,553 | 16,616
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | FFELP Loan ABCP Facilities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings |  | 2,053
Long-term borrowings | 462 | 479
Total | 462 | 2,532
Loans | 455 | 2,533
Cash | 9 | 36
Other assets, Net | 17 | 76
Total assets | 481 | 2,645
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Private Education Loan ABCP Facilities [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 1,194 | 2,582
Long-term borrowings | 1,259 |
Total | 2,453 | 2,582
Loans | 2,494 | 2,835
Cash | 74 | 74
Other assets, Net | 27 | 27
Total assets | 2,595 | 2,936
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Total Before Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Short-term borrowings | 2,026 | 5,595
Long-term borrowings | 68,875 | 69,067
Total | 70,901 | 74,662
Loans | 72,552 | 76,726
Cash | 2,275 | 2,322
Other assets, Net | 1,695 | 1,728
Total assets | 76,522 | 80,776
Assets and Liabilities of Consolidated Variable Interest Entities [Member] | Hedge Accounting Adjustments [Member] |  |
Securities Financing Transaction [Line Items] |  |
Long-term borrowings | (25) | (167)
Total | (25) | (167)
Other assets, Net | (116) | (308)
Total assets | $ (116) | $ (308)

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