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Borrowings - Secured Financing (Details) - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2021 | May 31, 2021 | Mar. 31, 2022 | Dec. 31, 2021
Securities Financing Transaction [Line Items] |  |  |  |
Total Issued |  |  |  | $ 1,592,000,000
Total loans and accrued interest amount securitized at inception |  |  | $ 0 | $ 1,656,263,000
2021-B |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Total Issued |  | $ 531,000,000 |  |
Basis spread on variable rate |  | 0.77% |  |
Weighted Average Life (in years) |  | 4 years 3 months 3 days |  |
2021-D |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Total Issued | $ 527,000,000 |  |  |
Basis spread on variable rate | 0.69% |  |  |
Weighted Average Life (in years) | 4 years 2 months 19 days |  |  |
2021-E |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Total Issued | $ 534,000,000 |  |  |
Basis spread on variable rate | 0.69% |  |  |
Weighted Average Life (in years) | 4 years 1 month 24 days |  |  |
Private Education Loan term securitizations |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Loans pledged as collateral |  |  | 1,460,000,000 |
Principal amount of collateral |  |  | 1,370,000,000 |
Capitalized interest |  |  | $ 87,000,000 |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
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