v3.26.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2026
May 11, 2026
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Entity Registrant Name Starwood Real Estate Income Trust, Inc.  
Entity Central Index Key 0001711929  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Interactive Data Current Yes  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity Tax Identification Number 82-2023409  
Entity Incorporation, State or Country Code MD  
Entity File Number 000-56046  
Entity Address, Address Line One 2340 Collins Avenue  
Entity Address, City or Town Miami Beach  
Entity Address, State or Province FL  
Entity Address, Postal Zip Code 33139  
City Area Code 305  
Local Phone Number 695-5500  
Document Quarterly Report true  
Document Transition Report false  
Common Stock Class T    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   4,597,114
Common Stock Class S    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   172,900,751
Common Stock Class D    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   24,350,492
Common Stock Class I    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   185,175,639