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LOANS - Summary of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest income	$ 322,859	$ 398,780	$ 1,010,264	$ 450,333
Net gains (losses) on disposal of investments and other			(49,563)	453,262
Net income (loss) attributable to Annaly	(295,642)	856,202	1,455,171	(2,784,053)
Residential Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest income	38,963	42,872	76,072	90,429
Net gains (losses) on disposal of investments and other	(21,721)	(5,376)	(26,941)	(17,376)
Net unrealized gains (losses) on instruments measured at fair value through earnings	14,456	110,545	36,911	(82,218)
Net income (loss) attributable to Annaly	$ 31,698	$ 148,041	$ 86,042	$ (9,165)

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