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LOANS - Summary of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest income	$ (45,334)	$ 277,997	$ (57,834)	$ 1,334,065
Net income (loss) attributable to Annaly	(562,205)	(275,264)	(1,239,428)	2,613,687
Residential Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest income	181,965	109,973	491,397	275,083
Net gains (losses) on disposal of investments	(1,087)	1,103	(3,358)	(11,555)
Net unrealized gains (losses) on instruments measured at fair value through earnings	(418,776)	(541,771)	(326,096)	(1,281,501)
Net income (loss) attributable to Annaly	$ (237,898)	$ (430,695)	$ 161,943	$ (1,017,973)

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