| Cover Page - USD ($) $ in Billions | 12 Months Ended | ||
| Dec. 31, 2019 | Apr. 28, 2020 | Jun. 28, 2019 | |
| Entity Information [Line Items] | |||
| Document Type | 10-K/A | ||
| Amendment Flag | true | ||
| Amendment Description | This Amendment No. 2 to the Annual Report on Form 10-K (this “Amendment No. 2”) of TPG RE Finance Trust, Inc. (the “Company,” “we,” “us,” and “our”) amends the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, which was filed with the Securities and Exchange Commission (the “SEC”) on February 19, 2020 (the “2019 Form 10-K”) and amended by Amendment No. 1 to the 2019 Form 10-K, which was filed with the SEC on April 29, 2020 (“Amendment No. 1”). Amendment No. 1 did not include a Cover Page Interactive Data File as required under Rule 406 of Regulation S-T. This Amendment No. 2 is being filed for the sole purpose of re-filing Amendment No. 1 to include a Cover Page Interactive Data File as required under Rule 406 of Regulation S-T. No other changes have been made to Amendment No. 1. In addition, as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), updated certifications of the Company’s principal executive officer and principal financial officer are included as exhibits hereto. This Amendment No. 2 does not amend, update or change the financial statements, consents or any other items or disclosures contained in the 2019 Form 10-K or Amendment No. 1 and does not otherwise reflect events occurring after the original filing date of the 2019 Form 10-K. Accordingly, this Amendment No. 2 should be read in conjunction with the 2019 Form 10-K and the Company’s other filings with the SEC subsequent to the filing of the 2019 Form 10-K. | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Document Period End Date | Dec. 31, 2019 | ||
| Entity File Number | 001-38156 | ||
| Entity Registrant Name | TPG RE Finance Trust, Inc | ||
| Entity Central Index Key | 0001630472 | ||
| Entity Incorporation, State or Country Code | MD | ||
| 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 | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Interactive Data Current | Yes | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Entity Small Business | false | ||
| Entity Emerging Growth Company | false | ||
| Entity Shell Company | false | ||
| Entity Public Float | $ 1.1 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Document Fiscal Year Focus | 2019 | ||
| Document Fiscal Period Focus | FY | ||
| Title of 12(b) Security | Common Stock, par value $0.001 per share | ||
| Trading Symbol | TRTX | ||
| Security Exchange Name | NYSE | ||
| Common Stock [Member] | |||
| Entity Information [Line Items] | |||
| Entity Common Stock, Shares Outstanding | 76,650,996 | ||
| Common Class A [Member] | |||
| Entity Information [Line Items] | |||
| Entity Common Stock, Shares Outstanding | 0 |
