Subsequent Events (Details) - USD ($)	1 Months Ended		3 Months Ended	12 Months Ended
	Apr. 30, 2025	Jan. 31, 2022	Mar. 31, 2025	Dec. 31, 2024	Jul. 31, 2021
Subsequent Events
Principal amount of notes purchased by third-party investors					$ 210,100,000
Senior Notes Due 2030 | Subsequent Event
Subsequent Events
Face amount	$ 500,000,000.0
Coupon rate (as a percent)	6.50%
Weighted average coupon rate	2.61%
Starwood 2025-SIF5 | Subsequent Event
Subsequent Events
Face amount	$ 500,000,000.0
Weighted average coupon rate	1.73%
Principal amount of notes purchased by third-party investors	$ 413,500,000
CLO contribution period	3 years
STWD 2021-SIF2
Subsequent Events
Face amount		$ 500,000,000.0
Principal amount of notes purchased by third-party investors		$ 410,000,000.0
CLO contribution period		3 years
Financing
Subsequent Events
Face amount			$ 3,172,013,000	$ 3,204,296,000
Financing | STWD 2021-SIF2
Subsequent Events
Face amount			$ 410,000,000	$ 410,000,000
Weighted average coupon rate			2.11%	2.11%
Financing | STWD 2021-SIF2 | Subsequent Event
Subsequent Events
Face amount	$ 415,900,000