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Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 16, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-34436    
Entity Registrant Name Starwood Property Trust, Inc.    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 27-0247747    
Entity Address, Address Line One 591 West Putnam Avenue    
Entity Address, City or Town Greenwich    
Entity Address, State or Province CT    
Entity Address, Postal Zip Code 06830    
City Area Code 203    
Local Phone Number 422-7700    
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol STWD    
Security Exchange Name NYSE    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 5.7
Entity Common Stock, Shares Outstanding   313,375,899  
Documents Incorporated by Reference
Documents Incorporated By Reference: The information required by Part III of this Form 10-K, to the extent not set forth herein or by amendment, is incorporated by reference from the registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A on or prior to April 29, 2024.
    
Entity Central Index Key 0001465128    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false