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LOANS - Summary of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest income	$ 398,780	$ 177,381	$ 450,333	$ 395,872
Net gains (losses) on disposal of investments and other			453,262	(132,249)
Net income (loss) attributable to Annaly	856,202	(1,776,330)	(2,784,053)	(2,625,480)
Residential Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest income	42,872	35,025	90,429	65,016
Net gains (losses) on disposal of investments and other	(5,376)	(4,605)	(17,376)	(9,828)
Net unrealized gains (losses) on instruments measured at fair value through earnings	110,545	25,891	(82,218)	43,712
Net income (loss) attributable to Annaly	$ 148,041	$ 56,311	$ (9,165)	$ 98,900

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

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