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v3.22.2.2

Borrowings - Company's Borrowings (Detail) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-term borrowings | $ 5,677 | $ 2,490
Long-term borrowings | 63,998 | 74,488
Total | 69,675 | 76,978
Total Before Hedge Accounting Adjustments [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 5,692 | 2,490
Long-term borrowings | 64,658 | 74,231
Total | 70,350 | 76,721
Total Before Hedge Accounting Adjustments [Member] | Senior Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 1,299 |
Long-term borrowings | 5,709 | 7,014
Total | 7,008 | 7,014
Total Before Hedge Accounting Adjustments [Member] | Total Unsecured Borrowings [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 1,299 |
Long-term borrowings | 5,709 | 7,014
Total | 7,008 | 7,014
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan Securitizations [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 83 |
Long-term borrowings | 45,358 | 51,841
Total | 45,441 | 51,841
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan Securitizations [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 813 | 543
Long-term borrowings | 13,300 | 14,074
Total | 14,113 | 14,617
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan ABCP Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 974 | 282
Long-term borrowings | 291 | 150
Total | 1,265 | 432
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan ABCP Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 2,418 | 1,363
Long-term borrowings |  | 1,152
Total | 2,418 | 2,515
Total Before Hedge Accounting Adjustments [Member] | Other [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 105 | 302
Total | 105 | 302
Total Before Hedge Accounting Adjustments [Member] | Secured Borrowings [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 4,393 | 2,490
Long-term borrowings | 58,949 | 67,217
Total | 63,342 | 69,707
Hedge Accounting Adjustments [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | (15) |
Long-term borrowings | (660) | 257
Total | $ (675) | $ 257

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