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Borrowings - Narrative (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 15, 2023 | Mar. 31, 2023 | Mar. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | May 17, 2022
Line of Credit Facility [Line Items] |  |  |  |  |  |
Estimated weighted average life of student loans |  | 5 years |  |  | 5 years |
Vertical risk retention interest |  |  | 5.00% | 5.00% |  |
Uncommitted federal funds |  | $ 125,000,000 | $ 125,000,000 | $ 125,000,000 |  |
Lendable value of collateral |  | 2,100,000,000 | 2,100,000,000 | 2,100,000,000 | $ 2,200,000,000 |
ABCP borrowings | Secured Borrowings |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Secured borrowing facility maximum borrowing capacity |  |  |  |  |  | $ 2,000,000,000
Residual interest percentage of facility trust |  |  |  |  |  | 100.00%
Secured borrowings outstanding |  | 0 | 0 | 0 | $ 0 |
2023-A |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
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 |  | 639,000,000 | 639,000,000 | 639,000,000 |  |
Principal amount of collateral |  | 598,000,000 | 598,000,000 | 598,000,000 |  |
Capitalized interest |  | $ 41,000,000 | $ 41,000,000 | $ 41,000,000 |  |
2023-A | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 1.53% |  |  |  |  |

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- Definition Estimated weighted average life of student loans. + References No definition available. + Details
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- Definition Lendable value of collateral + References No definition available. + Details
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- Definition Loans Pledged As Collateral, Capitalized Interest + References No definition available. + Details
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- Definition Loans Pledged As Collateral, Principal Amount + References No definition available. + Details
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- Definition Loans Securitized or Asset Backed Financing Arrangement Ownership Interest Percentage + References No definition available. + Details
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- Definition Residual Interest Percentage Of Facility Trust + References No definition available. + Details
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- Definition Uncommitted Federal Funds + References No definition available. + Details
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- Definition Vertical Risk Retention, Percentage + References No definition available. + Details
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- Definition Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition This is the principal amount outstanding for loans which are in the process of being securitized as of the date of the statement of financial position (across all types of loans). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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- Definition The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585 + Details
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- Definition Fair value of the securities pledged as collateral against securities loaned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226013-175313 + Details
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