Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2022	Apr. 29, 2022
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Document Quarterly Report	true
Document Transition Report	false
Entity Registrant Name	TPG RE Finance Trust, Inc.
Entity Central Index Key	0001630472
Current Fiscal Year End Date	--12-31
Entity Incorporation, State or Country Code	MD
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		77,185,845
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity File Number	001-38156
Entity Tax Identification Number	36-4796967
Entity Address, Address Line One	888 Seventh Avenue
Entity Address, Address Line Two	35th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10106
City Area Code	212
Local Phone Number	601-4700
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	TRTX
Security Exchange Name	NYSE
6.25% Series C Cumulative Redeemable Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	6.25% Series C Cumulative Redeemable Preferred Stock, par value $0.001 per share
Trading Symbol	TRTX PRC
Security Exchange Name	NYSE