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Borrowings - Long Term Borrowings Narrative (Details) - USD ($) |  |  |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 09, 2022 | Nov. 09, 2021 | Nov. 01, 2021 | Aug. 18, 2021 | May 19, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Aug. 31, 2022 | Nov. 30, 2021 | Aug. 31, 2021 | May 31, 2021 | Oct. 29, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Issued |  |  |  |  |  | $ 575,000,000 | $ 1,592,000,000 |  |  |  |  |  |
Unsecured debt issued |  |  |  |  |  | $ 0 | $ 492,135,000 | $ 495,000,000 |  |  |  |  |
Estimated weighted average life of student loans |  |  |  |  |  | 5 years | 4 years 8 months 12 days |  |  |  |  |  |
Senior Unsecured Notes Due October 29, 2025 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Issued |  |  |  |  |  | $ 496,000,000 |  |  |  |  |  |  | $ 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 |  |  | 493,000,000 |  |  |  |  |  |  |
Interest rate |  |  | 3.125% |  |  |  |  |  |  |  |  |  |
Issuance price |  |  | 99.43% |  |  |  |  |  |  |  |  |  |
SMB Private Education Loan Trust 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 |  |  |  |  |  | 635,000,000 |  |  |  |  |  |  |
Principal amount of collateral |  |  |  |  |  | 597,000,000 |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  | 38,000,000 |  |  |  |  |  |  |
SMB Private Education Loan Trust 2022-C | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.76% |  |  |  |  |  |  |  |  |  |  |  |
2021-B |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Issued |  |  |  |  |  |  |  |  |  |  |  | $ 531,000,000 |
Private education loan term accounted for as a secured financing |  |  |  |  | $ 531,000,000 |  |  |  |  |  |  |  |
Loans sold to third parties |  |  |  |  | 531,000,000 |  |  |  |  |  |  |  |
Unsecured debt issued |  |  |  |  | $ 529,000,000 |  |  |  |  |  |  |  |
Estimated weighted average life of student loans |  |  |  |  | 4 years 3 months 3 days |  |  |  |  |  |  |  |
Loans pledged as collateral |  |  |  |  |  | 410,000,000 |  |  |  |  |  |  |
Principal amount of collateral |  |  |  |  |  | 389,000,000 |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  | 21,000,000 |  |  |  |  |  |  |
Ownership interest percentage on asset-backed financing |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
2021-B | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 0.77% |  |  |  |  |  |  |  |
2021-D |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Issued |  |  |  |  |  |  |  |  |  |  | $ 527,000,000 |  |
Private education loan term accounted for as a secured financing |  |  |  | $ 527,000,000 |  |  |  |  |  |  |  |  |
Loans sold to third parties |  |  |  | 527,000,000 |  |  |  |  |  |  |  |  |
Unsecured debt issued |  |  |  | $ 525,000,000 |  |  |  |  |  |  |  |  |
Estimated weighted average life of student loans |  |  |  | 4 years 2 months 19 days |  |  |  |  |  |  |  |  |
Principal amount of collateral |  |  |  |  |  | 403,000,000 |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  | 22,000,000 |  |  |  |  |  |  |
Ownership interest percentage on asset-backed financing |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Loans |  |  |  |  |  | 425,000,000 |  |  |  |  |  |  |
2021-D | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.69% |  |  |  |  |  |  |  |  |
2021-E |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Issued |  |  |  |  |  |  |  |  |  | $ 534,000,000 |  |  |
Private education loan term accounted for as a secured financing |  | $ 534,000,000 |  |  |  |  |  |  |  |  |  |  |
Loans sold to third parties |  | 534,000,000 |  |  |  |  |  |  |  |  |  |  |
Unsecured debt issued |  | $ 532,000,000 |  |  |  |  |  |  |  |  |  |  |
Estimated weighted average life of student loans |  | 4 years 1 month 24 days |  |  |  |  |  |  |  |  |  |  |
Principal amount of collateral |  |  |  |  |  | 416,000,000 |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  | 23,000,000 |  |  |  |  |  |  |
Ownership interest percentage on asset-backed financing |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Loans |  |  |  |  |  | 439,000,000 |  |  |  |  |  |  |
2021-E | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.69% |  |  |  |  |  |  |  |  |  |  |
ABS Transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Private education loan term accounted for as a secured financing |  |  |  |  |  |  |  | $ 8,210,000,000 |  |  |  |  |
Private Education Loans |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Private education loan term accounted for as a secured financing |  |  |  |  |  | 3,750,000,000 |  |  |  |  |  |  |
Principal amount of collateral |  |  |  |  |  | 3,630,000,000 |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  | $ 120,000,000 |  |  |  |  |  |  |

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