CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands		Total		Total stockholder’s equity	Preferred stock	Common stock	Additional paid-in capital	Accumulated other comprehensive income (loss)	Accumulated deficit		Noncontrolling interests
Beginning of period at Dec. 31, 2022					$ 1,536,569	$ 4,683	$ 22,981,320	$ (3,708,896)	$ (9,543,233)		$ 98,983
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance						262	579,838
Stock-based award activity						3	11,838
Unrealized gains (losses) on available-for-sale securities		$ (443,957)						(443,957)
Reclassification adjustment for net (gains) losses included in net income (loss)		1,458,077						1,458,077
Net income (loss) attributable to Annaly		(1,239,428)							(1,239,428)
Dividends declared on preferred stock	[1]								(104,495)
Dividends and dividend equivalents declared on common stock and stock-based awards		(968,111)							(968,111)	[1]
Net income (loss) attributable to noncontrolling interests		7,797									(7,797)
Equity contributions from (distributions to) noncontrolling interests											21,401
End of period at Sep. 30, 2023		10,677,057		$ 10,564,470	1,536,569	4,948	23,572,996	(2,694,776)	(11,855,267)		112,587
Beginning of period at Jun. 30, 2023					1,536,569	4,939	23,550,346	(2,382,531)	(10,933,044)		111,066
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance						9	17,500
Stock-based award activity							5,150
Unrealized gains (losses) on available-for-sale securities		(825,286)						(825,286)
Reclassification adjustment for net (gains) losses included in net income (loss)		513,041						513,041
Net income (loss) attributable to Annaly		(562,205)							(562,205)
Dividends declared on preferred stock	[1]								(36,854)
Dividends and dividend equivalents declared on common stock and stock-based awards		(323,164)							(323,164)	[1]
Net income (loss) attributable to noncontrolling interests		6,879									(6,879)
Equity contributions from (distributions to) noncontrolling interests											8,400
End of period at Sep. 30, 2023		10,677,057		10,564,470	1,536,569	4,948	23,572,996	(2,694,776)	(11,855,267)		112,587
Beginning of period at Dec. 31, 2023		11,345,091	[2]		1,536,569	5,001	23,672,391	(1,335,400)	(12,622,768)		89,298
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance						576	1,159,774
Stock-based award activity						3	19,439
Unrealized gains (losses) on available-for-sale securities		92,843						92,843
Reclassification adjustment for net (gains) losses included in net income (loss)		530,354						530,354
Net income (loss) attributable to Annaly		519,854							519,854
Dividends declared on preferred stock	[1]								(115,847)
Dividends and dividend equivalents declared on common stock and stock-based awards		(1,019,527)							(1,019,527)	[1]
Net income (loss) attributable to noncontrolling interests		(18,838)									18,838
Equity contributions from (distributions to) noncontrolling interests											(11,449)
End of period at Sep. 30, 2024		12,539,949		12,443,262	1,536,569	5,580	24,851,604	(712,203)	(13,238,288)		96,687
Beginning of period at Jun. 30, 2024					1,536,569	5,010	23,694,663	(1,156,927)	(12,898,191)		81,780
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance						570	1,148,881
Stock-based award activity							8,060
Unrealized gains (losses) on available-for-sale securities		428,955						428,955
Reclassification adjustment for net (gains) losses included in net income (loss)		15,769						15,769
Net income (loss) attributable to Annaly		66,445							66,445
Dividends declared on preferred stock	[1]								(41,628)
Dividends and dividend equivalents declared on common stock and stock-based awards		(364,914)							(364,914)	[1]
Net income (loss) attributable to noncontrolling interests		(15,906)									15,906
Equity contributions from (distributions to) noncontrolling interests											(999)
End of period at Sep. 30, 2024		$ 12,539,949		$ 12,443,262	$ 1,536,569	$ 5,580	$ 24,851,604	$ (712,203)	$ (13,238,288)		$ 96,687

[1] (1) Refer to the “Capital Stock” Note for dividends per share for each class of shares.

[2] (1)Derived from the audited consolidated financial statements at December 31, 2023.