XML 80 R56.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Significant Accounting Policies - Allowance for FFELP Loans and Loan Interest Income (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Accounting Policies [Abstract] |  |
Percentage reimbursement on all qualifying default claims period two (as a percentage) | 97.00% |
Percentage reimbursement on all qualifying default claims period one (as a percentage) | 98.00% |
Variable rate | 100.00% |
Maximum loss exposure due to federal guarantee | 3.00% |
Basis points | 0.0105 |
Loans in nonaccrual status | $ 0 | $ 0

X
- Definition Constant Prepayment Fee, Variable Rate + References No definition available. + Details
Name: | slm_ConstantPrepaymentFeeVariableRate
Namespace Prefix: | slm_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans in Nonaccrual Status + References No definition available. + Details
Name: | slm_LoansinNonaccrualStatus
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage Reimbursement On All Qualifying Default Claims, Maximum Loss Exposure + References No definition available. + Details
Name: | slm_PercentageReimbursementOnAllQualifyingDefaultClaimsMaximumLossExposure
Namespace Prefix: | slm_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage reimbursement on all qualifying default claims period one. + References No definition available. + Details
Name: | slm_PercentageReimbursementOnAllQualifyingDefaultClaimsPeriodOne
Namespace Prefix: | slm_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage reimbursement on all qualifying default claims period three. + References No definition available. + Details
Name: | slm_PercentageReimbursementOnAllQualifyingDefaultClaimsPeriodThree
Namespace Prefix: | slm_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage Reimbursement On All Qualifying FFELP Default Claims Period Two + References No definition available. + Details
Name: | slm_PercentageReimbursementOnAllQualifyingFfelpDefaultClaimsPeriodTwo
Namespace Prefix: | slm_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration