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Borrowings - Company's Borrowings (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-term borrowings | $ 4,068 | $ 6,613
Long-term borrowings | 75,814 | 77,332
Total | 79,882 | 83,945
Total Before Hedge Accounting Adjustments [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 4,038 | 6,609
Long-term borrowings | 75,340 | 76,781
Total | 79,378 | 83,390
Total Before Hedge Accounting Adjustments [Member] | Senior Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 1,658 | 677
Long-term borrowings | 6,465 | 7,714
Total | 8,123 | 8,391
Total Before Hedge Accounting Adjustments [Member] | Total Unsecured Borrowings [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 1,658 | 677
Long-term borrowings | 6,465 | 7,714
Total | 8,123 | 8,391
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan Securitizations [Member] |  |
Debt Instrument [Line Items] |  |
Long-term borrowings | 54,000 | 54,697
Total | 54,000 | 54,697
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan Securitizations [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 832 | 960
Long-term borrowings | 13,154 | 13,891
Total | 13,986 | 14,851
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan ABCP Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings |  | 2,053
Long-term borrowings | 462 | 479
Total | 462 | 2,532
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan ABCP Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 1,194 | 2,582
Long-term borrowings | 1,259 |
Total | 2,453 | 2,582
Total Before Hedge Accounting Adjustments [Member] | Other [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 354 | 337
Total | 354 | 337
Total Before Hedge Accounting Adjustments [Member] | Secured Borrowings [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 2,380 | 5,932
Long-term borrowings | 68,875 | 69,067
Total | 71,255 | 74,999
Hedge Accounting Adjustments [Member] |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | 30 | 4
Long-term borrowings | 474 | 551
Total | $ 504 | $ 555

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