LOANS - Summary of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest income	$ 247,796	$ (111,384)	$ 1,469,152
Net income (loss) attributable to Annaly	1,001,906	(1,643,171)	$ 1,725,325
Residential mortgage loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest income	1,282,941	703,838
Net gains (losses) on disposal of investments	(10,761)	(5,049)
Net unrealized gains (losses) on instruments measured at fair value through earnings	(15,333)	374,764
Net income (loss) attributable to Annaly	$ 1,256,847	$ 1,073,553