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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Detail) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total earning assets, Carrying Value | $ 70,130 | $ 76,657 |
Short-term borrowings, Carrying Value | 5,677 | 2,490 |
Long-term borrowings, Carrying Value | 63,998 | 74,488 |
Total | 69,675 | 76,978 |
Total earning assets, Fair Value | 67,002 | 78,617 |
Short-term borrowings, Fair Value | 5,684 | 2,492 |
Long-term borrowings, Fair Value | 60,787 | 74,548 |
Total interest-bearing liabilities, Fair Value | 66,471 | 77,040 |
FFELP Loans [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Loans, Carrying Value | 46,891 | 52,641 |
Loans receivable, Fair Value | 44,627 | 53,632 |
Floor Income Contracts [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative financial instruments, Carrying Value |  | (65) |
Derivative financial instruments, Fair Value |  | (65) |
Interest Rate Swaps [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative financial instruments, Carrying Value | 47 | 219 |
Derivative financial instruments, Fair Value | 47 | 219 |
Cross-Currency Interest Rate Swaps [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative financial instruments, Carrying Value | (407) | (190) |
Derivative financial instruments, Fair Value | (407) | (190) |
Private Education Loans [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Loans, Carrying Value | 19,151 | 20,171 | $ 20,018
Loans receivable, Fair Value | 18,287 | 21,140 |
Difference [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total earning assets, Fair Value | (3,128) | 1,960 |
Short-term borrowings, Fair Value | (7) | (2) |
Long-term borrowings, Fair Value | 3,211 | (60) |
Total interest-bearing liabilities, Fair Value | 3,204 | (62) |
Excess of net asset fair value over carrying value | 76 | 1,898 |
Difference [Member] | FFELP Loans [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Loans receivable, Fair Value | (2,264) | 991 |
Difference [Member] | Private Education Loans [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Loans receivable, Fair Value | (864) | 969 |
Carrying Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and investments | 4,088 | 3,845 |
Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and investments | $ 4,088 | $ 3,845 |

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