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Subsequent Events (Details) - USD ($) | Feb. 18, 2025 | Feb. 06, 2025 | Jan. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Oct. 29, 2020
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Subsequent Event [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 2,216,000,000 | $ 1,147,000,000 |
Unsecured Debt | Senior Unsecured Notes Due October 29, 2025 |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 499,000,000 |  | $ 500,000,000
Interest rate |  |  |  |  |  | 4.20%
Subsequent Event | Unsecured Debt | Senior Unsecured Notes Due October 29, 2025 |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Interest rate | 4.20% |  |  |  |  |
Repayment of long-term debt | $ 500,000,000 |  |  |  |  |
Redemption price | 100.00% |  |  |  |  |
Loss on early extinguishment of unsecured debt | $ 1,000,000 |  |  |  |  |
Subsequent Event | Unsecured Debt | Senior Unsecured Notes Due February XX 2028 Member |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 500,000,000 |  |  |
Interest rate |  |  | 6.50% |  |  |
Private Education Loans | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Total Private Education Loans sold |  | $ 2,000,000,000 |  |  |  |
Loan principal |  | 1,800,000,000 |  |  |  |
Capitalized interest |  | 163,000,000 |  |  |  |
Financing receivable, sale, accrued interest |  | $ 10,000,000 |  |  |  |

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- Definition Financing Receivable, Sale, Capitalized Interest + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482949/835-30-55-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482900/835-30-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 + Details
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