v3.26.1
Cover
Apr. 30, 2026
Document Information [Line Items]  
Document Type N-2
Document Registration Statement true
Pre-Effective Amendment false
Post-Effective Amendment true
Post-Effective Amendment Number 2
Dividend or Interest Reinvestment Plan Only false
Delayed or Continuous Offering true
Effective Upon Filing, 462(e) false
Additional Securities Effective, 413(b) false
Effective when Declared, Section 8(c) false
Effective upon Filing, 486(b) true
Effective on Set Date, 486(b) false
Effective after 60 Days, 486(a) false
Effective on Set Date, 486(a) false
New Effective Date for Previous Filing false
Additional Securities. 462(b) false
No Substantive Changes, 462(c) false
Exhibits Only, 462(d) false
Approximate Date of Commencement of Proposed Sale to Public As soon as practicable after the effective date of this Registration Statement
Amendment Flag false
Entity Information [Line Items]  
Entity Registrant Name TPG Twin Brook Capital Income Fund
Entity Central Index Key 0001913724
Securities Act File Number 333-286873
Entity Well-known Seasoned Issuer No
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Inv Company Type N-2
Entity Contact Personnel [Line Items]  
Entity Address, Address Line One 245 Park 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 10167
Entity Phone Fax Numbers [Line Items]  
City Area Code 212
Local Phone Number 692-2000
Business Contact [Member]  
Entity Contact Personnel [Line Items]  
Contact Personnel Name Jenny B. Neslin
Entity Address, Address Line One 245 Park 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 10167