XML 74 R59.htm IDEA: XBRL DOCUMENT
v3.22.2

Borrowings - Narrative (Details) - USD ($) |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 27, 2022 | Mar. 16, 2022 | Jun. 30, 2022 | Jun. 30, 2022 | May 17, 2022 | Dec. 31, 2021
Line of Credit Facility [Line Items] |  |  |  |  |  |
Secured financings issued |  |  | $ 0 | $ 0 |  | $ 1,656,263,000
Vertical risk retention interest |  |  | 5.00% | 5.00% |  |
Uncommitted federal funds |  |  | $ 125,000,000 | $ 125,000,000 |  |
Lendable value of collateral |  |  | $ 2,100,000,000 | $ 2,100,000,000 |  | $ 3,300,000,000
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% |
2022-A |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Vertical risk retention interest |  | 5.00% |  |  |  |
2022-A | Student Loan |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Private education loans sold |  | $ 973,000,000 |  |  |  |
Additional net proceeds from sales of loans held for investment, capitalized interest |  | 95,000,000 |  |  |  |
Gain on sale |  | $ 10,000,000 |  |  |  |
2022-B |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Vertical risk retention interest | 5.00% |  |  |  |  |
2022-B | Student Loan |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Private education loans sold | $ 2,000,000,000 |  |  |  |  |
Additional net proceeds from sales of loans held for investment, capitalized interest | 107,000,000 |  |  |  |  |
Gain on sale | $ 11,000,000 |  |  |  |  |

X
- Definition Additional Proceeds from Sale of Debt Securities, Available-for-sale + References No definition available. + Details
Name: | slm_AdditionalProceedsFromSaleOfDebtSecuritiesAvailableForSale
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Lendable value of collateral + References No definition available. + Details
Name: | slm_Lendablevalueofcollateral
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Loan Amount Securitized + References No definition available. + Details
Name: | slm_LoanAmountSecuritized
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Residual Interest Percentage Of Facility Trust + References No definition available. + Details
Name: | slm_ResidualInterestPercentageOfFacilityTrust
Namespace Prefix: | slm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Uncommitted Federal Funds + References No definition available. + Details
Name: | slm_UncommittedFederalFunds
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Vertical Risk Retention, Percentage + References No definition available. + Details
Name: | slm_VerticalRiskRetentionPercentage
Namespace Prefix: | slm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleRealizedGain
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slm_ABCPBorrowingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slm_A2022AMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_StudentLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slm_A2022BMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |