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Significant Accounting Policies (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Accounting Policies [Abstract]
Financing receivable, allowance for credit loss, period increase (decrease), change in estimate	$ (17)

X

- Definition

Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Change In Estimate

+ References

No definition available.

+ Details

Name:	slm_FinancingReceivableAllowanceForCreditLossPeriodIncreaseDecreaseChangeInEstimate
Namespace Prefix:	slm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration