Document and Entity Information
| Document and Entity Information | Jun. 05, 2024 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Entity Central Index Key | 0001849894 |
| Document Period End Date | Jun. 05, 2024 |
| Entity Registrant Name | MSD INVESTMENT CORP. |
| Securities Act File Number | 814-01481 |
| Entity Incorporation, State or Country Code | MD |
| Entity Tax Identification Number | 87-4195402 |
| Entity Address, Address Line One | One Vanderbilt Avenue |
| Entity Address, Address Line Two | 26th Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10017 |
| City Area Code | 212 |
| Local Phone Number | 303-4728 |
| Title of 12(b) Security | None |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |