Capital Gains Incentive Fee Expense (Reversal)

No definition available.

Name:	msdlf_CapitalGainsIncentiveFeeExpenseReversal
Namespace Prefix:	msdlf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Incentive Fee Payable, Capital Gains

+ References

No definition available.

+ Details

Name:	msdlf_IncentiveFeePayableCapitalGains
Namespace Prefix:	msdlf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Incentive Fee Payable, Income

+ References

No definition available.

+ Details

Name:	msdlf_IncentiveFeePayableIncome
Namespace Prefix:	msdlf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Income Based Incentive Fee Expense

+ References

No definition available.

+ Details

Name:	msdlf_IncomeBasedIncentiveFeeExpense
Namespace Prefix:	msdlf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Income Based Incentive Fee Expense, Net Of Waivers

+ References

No definition available.

+ Details

Name:	msdlf_IncomeBasedIncentiveFeeExpenseNetOfWaivers
Namespace Prefix:	msdlf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Investment Company, Management Fee Expense, After Reduction Of Fee Waiver And Reimbursement

+ References

No definition available.

+ Details

Name:	msdlf_InvestmentCompanyManagementFeeExpenseAfterReductionOfFeeWaiverAndReimbursement
Namespace Prefix:	msdlf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Management and Service Fees, Base Rate, Waived Rate Minimum Threshold

+ References

No definition available.

+ Details

Name:	msdlf_ManagementAndServiceFeesBaseRateWaivedRateMinimumThreshold
Namespace Prefix:	msdlf_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transactions, Agreement, Cumulative Lookback Provision Term

+ References

No definition available.

+ Details

Name:	msdlf_RelatedPartyTransactionsAgreementCumulativeLookbackProvisionTerm
Namespace Prefix:	msdlf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transactions, Agreement, Initial Term

+ References

No definition available.

+ Details

Name:	msdlf_RelatedPartyTransactionsAgreementInitialTerm
Namespace Prefix:	msdlf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of obligations incurred and payable classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(15)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

Name:	us-gaap_AccountsPayableOtherCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of expense for administrative fee from service provided, including, but not limited to, salary, rent, or overhead cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479105/946-220-45-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

+ Details

Name:	us-gaap_AdministrativeFeesExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expense reduction under arrangement in which third party explicitly reduces its fee by specified amount for service provided in exchange for use of investment company's assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481019/946-20-45-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

+ Details

Name:	us-gaap_InvestmentCompanyExpenseOffsetArrangement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of financial support committed by investment company to investee that is contractually required but not provided.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-16

+ Details

Name:	us-gaap_InvestmentCompanyFinancialCommitmentToInvesteeFutureAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482987/272-10-50-3

+ Details

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Base rate for management and service fees under arrangement to manage operations, including, but not limited to, investment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

+ Details

Name:	us-gaap_ManagementAndServiceFeesBaseRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate based on performance for management and service fees under arrangement to manage operations, including, but not limited to, investment.

+ References

+ Details

Name:	us-gaap_ManagementAndServiceFeesIncentiveRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of fee payable for management of fund or trust.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(12)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

+ Details

Name:	us-gaap_ManagementFeePayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-3

+ Details

Name:	us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

+ Details

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

- Details

Name:	dei_LegalEntityAxis=msdlf_MSCreditPartnersHoldingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=msdlf_MorganStanleyDirectLendingFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=msdlf_MSCreditPartnersHoldingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_RelatedPartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_IncentiveFeeRateQuarterlyHurdleRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_IncentiveFeeRateAnnualizedHurdleRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_IncentiveFeeRatePreIncentiveFeeNetInvestmentIncomeBelowCatchUpThresholdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_IncentiveFeeRateQuarterlyCatchUpThresholdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_IncentiveFeeRateAnnualizedCatchUpThresholdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_IncentiveFeeRatePreIncentiveFeeNetInvestmentIncomeExceedsCatchUpThresholdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_IncentiveFeeRateRealizedCapitalGainsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_WaiverPeriodIncentiveFeeRateRealizedCapitalGainsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_AdministrationAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_AmendedAndRestatedInvestmentAdvisoryAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_PreIncentiveFeeRateQuarterlyHurdleRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_PreIncentiveFeeNetInvestmentIncomeBelowCatchUpThresholdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_PreIncentiveFeeRateQuarterlyCatchUpThresholdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_PreIncentiveFeeRateAnnualizedCatchUpThresholdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_PreIncentiveFeeNetInvestmentIncomeExceedsCatchUpThresholdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_PreIncentiveFeeNetInvestmentIncomeCatchUpThresholdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_PreIncentiveFeeNetInvestmentIncomeIncentiveFeeCapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_WaiverPeriodPreIncentiveFeeNetInvestmentIncomeExceedsCatchUpThresholdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=msdlf_WaiverPeriodPreIncentiveFeeRateQuarterlyCatchUpThresholdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=msdlf_A2027NotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=msdlf_A2025NotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=msdlf_A2029NotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SIGNIFICANT AGREEMENTS AND RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands			3 Months Ended				9 Months Ended	12 Months Ended
	Jan. 26, 2024	Jan. 24, 2024	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2019
Related Party Transaction [Line Items]
Management fees, net of waiver			$ 25,479			$ 7,637		$ 6,679
Management fees payable			7,042			2,012		7,042	$ 2,012
Income based incentive fees, net of waivers			37,432							$ 26,635
Income based incentive fees								43,467	42,012	26,635
Reversal of capital gains incentive fees								0	0	2,441
Income based incentive fees payable			8,956			11,766		8,956	11,766
Capital call proceeds received in advance			0			0		0	0
Administrative service fees								216	178	72
Payable to affiliates			29			2,870		29	2,870
Expense support								$ 0	0	$ 44
MS Credit Partners Holdings \| Morgan Stanley Direct Lending Fund
Related Party Transaction [Line Items]
Ownership percentage							11.70%	11.00%
MS Credit Partners Holdings
Related Party Transaction [Line Items]
Unfunded commitments											$ 200,000
Related Party
Related Party Transaction [Line Items]
Base management fee rate								1.00%
Threshold minimum rate for waived portion								0.25%
Related party fees	$ 1,241
Related Party \| Quarterly hurdle rate
Related Party Transaction [Line Items]
Incentive rate								1.50%
Related Party \| Annualized hurdle rate
Related Party Transaction [Line Items]
Incentive rate				6.00%	6.00%			6.00%
Related Party \| Incentive Fee Rate Pre Incentive Fee Net Investment Income Below Catch Up Threshold
Related Party Transaction [Line Items]
Incentive rate								100.00%
Related Party \| Incentive Fee Rate Quarterly Catch Up Threshold
Related Party Transaction [Line Items]
Incentive rate								1.8182%
Related Party \| Incentive Fee Rate Annualized Catch Up Threshold
Related Party Transaction [Line Items]
Incentive rate								7.2728%
Related Party \| Incentive Fee Rate Pre Incentive Fee Net Investment Income Exceeds Catch Up Threshold
Related Party Transaction [Line Items]
Incentive rate								17.50%
Related Party \| Incentive Fee Rate Realized Capital Gains
Related Party Transaction [Line Items]
Incentive rate								17.50%
Related Party \| Incentive Fee Rate Realized Capital Gains, Waiver Period
Related Party Transaction [Line Items]
Incentive rate								15.00%
Related Party \| Administration Agreement
Related Party Transaction [Line Items]
Initial term								2 years
Payable to affiliates			$ 29			$ 178		$ 29	$ 178
Related Party \| Amended and Restated Investment Advisory Agreement
Related Party Transaction [Line Items]
Cumulative lookback provision term		3 years
Threshold minimum rate for waived portion		0.75%
Related Party \| Pre-Incentive Fee Rate Quarterly Hurdle Rate
Related Party Transaction [Line Items]
Incentive rate				1.50%	1.50%
Related Party \| Pre-Incentive Fee Net Investment Income Below Catch Up Threshold
Related Party Transaction [Line Items]
Incentive rate					100.00%			100.00%
Related Party \| Pre-Incentive Fee Rate Quarterly Catch Up Threshold
Related Party Transaction [Line Items]
Incentive rate								1.8182%
Related Party \| Pre-Incentive Fee Rate Annualized Catch Up Threshold
Related Party Transaction [Line Items]
Incentive rate								7.2728%
Related Party \| Pre-Incentive Fee Net Investment Income Exceeds Catch Up Threshold
Related Party Transaction [Line Items]
Incentive rate					17.50%			17.50%
Related Party \| Pre-Incentive Fee Net Investment Income Catch Up Threshold
Related Party Transaction [Line Items]
Incentive rate					17.50%
Related Party \| Pre-Incentive Fee Net Investment Income Incentive Fee Cap
Related Party Transaction [Line Items]
Incentive rate				17.50%
Related Party \| Waiver Period, Pre-Incentive Fee Net Investment Income Exceeds Catch Up Threshold
Related Party Transaction [Line Items]
Incentive rate								15.00%
Related Party \| Waiver Period, Pre-Incentive Fee Rate Quarterly Catch Up Threshold
Related Party Transaction [Line Items]
Incentive rate								1.7647%
Related Party \| 2027 Notes
Related Party Transaction [Line Items]
Related party fees								$ 213
Related Party \| 2025 Notes
Related Party Transaction [Line Items]
Related party fees								138
Related Party \| 2029 Notes
Related Party Transaction [Line Items]
Related party fees								$ 210