Fair Values - (Carrying Value and Fair Value of Financial Instruments) (Details) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Safehold Inc.
Book and estimated fair values of financial instruments
Number of shares owned (in shares)	13.5
Carrying Value
Book and estimated fair values of financial instruments
Loans receivable and other lending investments	$ 50	$ 21
Cash and cash equivalents	35	51
Restricted cash	11	10
Debt obligations, net	217	193
Fair Value
Book and estimated fair values of financial instruments
Loans receivable and other lending investments	49	17
Cash and cash equivalents	35	51
Restricted cash	11	10
Debt obligations, net	$ 222	$ 193