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LOANS - Summary of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest income	$ (111,384)	$ 1,469,152	$ 1,733,793
Net income (loss) attributable to Annaly	(1,643,171)	1,725,325	$ 2,389,896
Residential mortgage loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest income	703,838	410,195
Net gains (losses) on disposal of investments	(5,049)	(12,842)
Net unrealized gains (losses) on instruments measured at fair value through earnings	374,764	(1,420,645)
Net income (loss) attributable to Annaly	$ 1,073,553	$ (1,023,292)

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