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, 2023					$ 1,536,569	$ 5,001	$ 23,672,391	$ (1,335,400)	$ (12,622,768)		$ 89,298
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance						6	10,893
Stock-based award activity						3	11,379
Unrealized gains (losses) on available-for-sale securities		$ (336,112)						(336,112)
Reclassification adjustment for net (gains) losses included in net income (loss)		514,585						514,585
Net income (loss) attributable to Annaly		453,409							453,409
Dividends declared on preferred stock	[1]								(74,219)
Dividends and dividend equivalents declared on common stock and stock-based awards		(654,613)							(654,613)	[1]
Net income (loss) attributable to noncontrolling interests		(2,932)									2,932
Equity contributions from (distributions to) noncontrolling interests											(10,450)
End of period at Jun. 30, 2024		11,262,904		$ 11,181,124	1,536,569	5,010	23,694,663	(1,156,927)	(12,898,191)		81,780
Beginning of period at Mar. 31, 2024					1,536,569	5,004	23,673,687	(1,281,918)	(12,523,809)		86,580
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance						6	10,941
Stock-based award activity						0	10,035
Unrealized gains (losses) on available-for-sale securities		(54,243)						(54,243)
Reclassification adjustment for net (gains) losses included in net income (loss)		179,234						179,234
Net income (loss) attributable to Annaly		(9,483)							(9,483)
Dividends declared on preferred stock	[1]								(37,158)
Dividends and dividend equivalents declared on common stock and stock-based awards		(327,741)							(327,741)	[1]
Net income (loss) attributable to noncontrolling interests		(650)									650
Equity contributions from (distributions to) noncontrolling interests											(5,450)
End of period at Jun. 30, 2024		11,262,904		11,181,124	1,536,569	5,010	23,694,663	(1,156,927)	(12,898,191)		81,780
Beginning of period at Dec. 31, 2024		12,696,952	[2]		1,536,569	5,784	25,257,716	(1,017,682)	(13,173,146)		87,711
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance						631	1,255,657
Stock-based award activity						6	7,284
Unrealized gains (losses) on available-for-sale securities		198,436						198,436
Reclassification adjustment for net (gains) losses included in net income (loss)		79,200						79,200
Net income (loss) attributable to Annaly		181,323							181,323
Dividends declared on preferred stock	[1]								(74,417)
Dividends and dividend equivalents declared on common stock and stock-based awards		(876,062)							(876,062)	[1]
Net income (loss) attributable to noncontrolling interests		(9,353)									9,353
Equity contributions from (distributions to) noncontrolling interests											(4,000)
End of period at Jun. 30, 2025		13,474,363		13,381,299	1,536,569	6,421	26,520,657	(740,046)	(13,942,302)		93,064
Beginning of period at Mar. 31, 2025					1,536,569	6,023	25,749,468	(787,402)	(13,509,942)		89,792
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance						398	760,383
Stock-based award activity						0	10,806
Unrealized gains (losses) on available-for-sale securities		33,559						33,559
Reclassification adjustment for net (gains) losses included in net income (loss)		13,797						13,797
Net income (loss) attributable to Annaly		57,099							57,099
Dividends declared on preferred stock	[1]								(37,260)
Dividends and dividend equivalents declared on common stock and stock-based awards		(452,199)							(452,199)	[1]
Net income (loss) attributable to noncontrolling interests		(3,272)									3,272
Equity contributions from (distributions to) noncontrolling interests											0
End of period at Jun. 30, 2025		$ 13,474,363		$ 13,381,299	$ 1,536,569	$ 6,421	$ 26,520,657	$ (740,046)	$ (13,942,302)		$ 93,064

[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, 2024.