Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2022	May 10, 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
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	true
Entity Ex Transition Period	true
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		5,552,038
Common Stock Class S
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		209,116,539
Common Stock Class D
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		29,574,113
Common Stock Class I
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		226,839,317