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LOANS - Summary of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest income	$ (6,451)	$ 19,463
Net income (loss) attributable to Annaly	462,892	(844,256)
Residential Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest income	252,016	147,231
Net gains (losses) on disposal of investments	(2,117)	(776)
Net unrealized gains (losses) on instruments measured at fair value through earnings	(84,786)	260,441
Net income (loss) attributable to Annaly	$ 165,113	$ 406,896

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