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Borrowings - Long Term Borrowings Narrative (Details) - USD ($) |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 16, 2023 | Mar. 15, 2023 | Aug. 09, 2022 | Nov. 01, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Aug. 31, 2023 | Mar. 31, 2023 | Aug. 31, 2022 | Oct. 29, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Issued |  |  |  |  | $ 1,147,000,000 | $ 575,000,000 |  |  |  |  |
Unsecured debt issued |  |  |  |  | $ 0 | $ 0 | $ 492,135,000 |  |  |  |
Estimated weighted average life of student loans |  |  |  |  | 5 years | 5 years |  |  |  |  |
Senior Unsecured Notes Due October 29, 2025 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Issued |  |  |  |  | $ 497,000,000 |  |  |  |  |  | $ 500,000,000
Interest rate |  |  |  |  |  |  |  |  |  |  | 4.20%
Senior Unsecured Notes Due November 2, 2026 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Issued |  |  |  | $ 500,000,000 | 495,000,000 |  |  |  |  |  |
Interest rate |  |  |  | 3.125% |  |  |  |  |  |  |
Issuance price |  |  |  | 99.43% |  |  |  |  |  |  |
2023-A |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Issued |  |  |  |  |  |  |  |  | $ 579,000,000 |  |
Private education loan term accounted for as a secured financing |  | $ 579,000,000 |  |  |  |  |  |  |  |  |
Loans sold to third parties |  | $ 579,000,000 |  |  |  |  |  |  |  |  |
Ownership interest percentage on asset-backed financing |  | 100.00% |  |  |  |  |  |  |  |  |
Unsecured debt issued |  | $ 572,000,000 |  |  |  |  |  |  |  |  |
Estimated weighted average life of student loans |  | 5 years 21 days |  |  |  |  |  |  |  |  |
Loans pledged as collateral |  |  |  |  | 591,000,000 |  |  |  |  |  |
Principal amount of collateral |  |  |  |  | 551,000,000 |  |  |  |  |  |
Capitalized interest |  |  |  |  | 40,000,000 |  |  |  |  |  |
2023-A | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.53% |  |  |  |  |  |  |  |  |
2023-C |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Issued |  |  |  |  |  |  |  | $ 568,000,000 |  |  |
Private education loan term accounted for as a secured financing | $ 568,000,000 |  |  |  |  |  |  |  |  |  |
Loans sold to third parties | $ 568,000,000 |  |  |  |  |  |  |  |  |  |
Ownership interest percentage on asset-backed financing | 100.00% |  |  |  |  |  |  |  |  |  |
Unsecured debt issued | $ 568,000,000 |  |  |  |  |  |  |  |  |  |
Estimated weighted average life of student loans | 4 years 11 months 4 days |  |  |  |  |  |  |  |  |  |
Loans pledged as collateral |  |  |  |  | 620,000,000 |  |  |  |  |  |
Principal amount of collateral |  |  |  |  | 579,000,000 |  |  |  |  |  |
Capitalized interest |  |  |  |  | 41,000,000 |  |  |  |  |  |
2023-C | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.69% |  |  |  |  |  |  |  |  |  |
2022-C |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Issued |  |  |  |  |  |  |  |  |  | $ 575,000,000 |
Private education loan term accounted for as a secured financing |  |  | $ 575,000,000 |  |  |  |  |  |  |  |
Loans sold to third parties |  |  | $ 575,000,000 |  |  |  |  |  |  |  |
Ownership interest percentage on asset-backed financing |  |  | 100.00% |  |  |  |  |  |  |  |
Unsecured debt issued |  |  | $ 575,000,000 |  |  |  |  |  |  |  |
Estimated weighted average life of student loans |  |  | 4 years 8 months 8 days |  |  |  |  |  |  |  |
Loans pledged as collateral |  |  |  |  |  | $ 543,000,000 |  |  |  |  |
Principal amount of collateral |  |  |  |  |  | 513,000,000 |  |  |  |  |
Capitalized interest |  |  |  |  |  | $ 30,000,000 |  |  |  |  |
2022-C | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.76% |  |  |  |  |  |  |  |
ABS Transactions |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Private education loan term accounted for as a secured financing |  |  |  |  |  |  | $ 9,810,000,000 |  |  |  |
Private Education Loans |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Private education loan term accounted for as a secured financing |  |  |  |  | 4,020,000,000.00 |  |  |  |  |  |
Principal amount of collateral |  |  |  |  | 3,900,000,000 |  |  |  |  |  |
Capitalized interest |  |  |  |  | $ 128,000,000 |  |  |  |  |  |

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