Secured Borrowings - Narrative (Details) $ in Thousands	1 Months Ended						3 Months Ended
	Mar. 31, 2025 USD ($)	Jan. 31, 2025 USD ($)	Oct. 31, 2024 USD ($)	May 31, 2024 USD ($)	Jan. 31, 2022 USD ($)	Jul. 31, 2021 USD ($) hotel	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Feb. 28, 2022 USD ($)	May 31, 2021 USD ($)	Aug. 31, 2019 USD ($)
Secured Borrowings
Principal amount of notes purchased by third-party investors						$ 210,100
RMBS
Secured Borrowings
Securitizations of loans						$ 230,000
Number of hotels | hotel						41
Morgan Stanley Bank, N.A.
Secured Borrowings
Amount at risk	$ 1,100,000						$ 1,100,000
Weighted average extended maturities							3 years 6 months
Wells Fargo Bank, N.A.
Secured Borrowings
Amount at risk	905,900						$ 905,900
Weighted average extended maturities							8 years 4 months 24 days
JPMorgan Chase Bank N.A.
Secured Borrowings
Amount at risk	$ 649,400						$ 649,400
Weighted average extended maturities							4 years 4 months 24 days
Repurchase Agreements
Secured Borrowings
Percentage of repurchase agreements for which margin calls are limited to collateral specific credit marks	63.00%						63.00%
Percentage of repurchase agreements containing margin call provisions for general capital market activity	37.00%						37.00%
Percentage of repurchase agreements containing margin call provisions that pertain to loans held-for-sale	6.00%						6.00%
Secured Borrowings
Secured Borrowings
Amortization of deferred financing costs							$ 8,800	$ 9,600
Long-term debt, gross	$ 12,529,958						12,529,958		$ 11,236,129
Revolving Credit Facility
Secured Borrowings
Increase in borrowing capacity		$ 50,000
Maximum borrowing capacity		200,000
Term Loan Facility | Secured Borrowings | Line of Credit
Secured Borrowings
Face Amount		$ 900,000
Decrease in weighted average spread		0.73%
Infrastructure Credit Facility | Line of Credit
Secured Borrowings
Decrease in weighted average spread	0.20%
Increase in borrowing capacity	$ 125,000						125,000
STWD 2022-FL3
Secured Borrowings
Face Amount										$ 1,000,000
Principal amount of notes purchased by third-party investors										842,500
Long-term debt, gross										82,500
Liquidation preference										$ 75,000
Repayments of debt							7,300
STWD 2021-FL2
Secured Borrowings
Face Amount											$ 1,300,000
Principal amount of notes purchased by third-party investors											1,100,000
Long-term debt, gross											70,100
Liquidation preference											$ 127,500
Repayments of debt							9,500
STWD 2019-FL1
Secured Borrowings
Face Amount												$ 1,100,000
Principal amount of notes purchased by third-party investors												936,400
Long-term debt, gross												86,600
Liquidation preference												$ 77,000
Repayments of debt							100
STWD 2021-HTS
Secured Borrowings
Repayments of debt							15,400
Starwood 2024-SIF4
Secured Borrowings
Face Amount			$ 600,000
Principal amount of notes purchased by third-party investors			496,200
Long-term debt, gross			$ 103,800
CLO contribution period			3 years
Additional contribution to CLO							127,900
Additional assets obtained by collateralized loan obligations							19,000
STWD 2021-SIF1
Secured Borrowings
Repayments of debt			$ 402,800
STWD 2024-SIF3
Secured Borrowings
Face Amount				$ 400,000
Principal amount of notes purchased by third-party investors				330,000
Long-term debt, gross				$ 70,000
CLO contribution period				3 years
Additional contribution to CLO							59,100
STWD 2021-SIF2
Secured Borrowings
Face Amount					$ 500,000
Principal amount of notes purchased by third-party investors					410,000
Liquidation preference					$ 90,000
CLO contribution period					3 years
Additional contribution to CLO							24,100
CLOs and SASB
Secured Borrowings
Amortization of deferred financing costs							1,200	$ 2,000
Incurred debt issuance costs							38,500
Deferred financing costs, net of amortization	$ 6,700						$ 6,700		$ 7,900