| Cover | Mar. 06, 2023 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 06, 2023 |
| Entity Registrant Name | TPG RE Finance Trust, Inc. |
| Entity Incorporation, State or Country Code | MD |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001630472 |
| 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 |
| Six Point Two Five Percentage Series C Cumulative Redeemable Preferred Stock | |
| Document Information [Line Items] | |
| Title of 12(b) Security | 6.25% Series C Cumulative RedeemablePreferred Stock, par value $0.001 per share |
| Trading Symbol | TRTX PRC |
| Security Exchange Name | NYSE |
