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					0	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					0	570	1,148,881
Stock-based award activity						0	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
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					265,911	1,021	2,078,388
Stock-based award activity						6	16,872
Unrealized gains (losses) on available-for-sale securities		311,717						311,717
Reclassification adjustment for net (gains) losses included in net income (loss)		81,578						81,578
Net income (loss) attributable to Annaly		1,013,768							1,013,768
Dividends declared on preferred stock	[1]								(111,883)
Dividends and dividend equivalents declared on common stock and stock-based awards		(1,355,722)							(1,355,722)	[1]
Net income (loss) attributable to noncontrolling interests		(19,971)									19,971
Equity contributions from (distributions to) noncontrolling interests											(22,000)
End of period at Sep. 30, 2025		14,996,579		14,910,897	1,802,480	6,811	27,352,976	(624,387)	(13,626,983)		85,682
Beginning of period at Jun. 30, 2025					1,536,569	6,421	26,520,657	(740,046)	(13,942,302)		93,064
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance					265,911	390	822,731
Stock-based award activity						0	9,588
Unrealized gains (losses) on available-for-sale securities		113,281						113,281
Reclassification adjustment for net (gains) losses included in net income (loss)		2,378						2,378
Net income (loss) attributable to Annaly		832,445							832,445
Dividends declared on preferred stock	[1]								(37,466)
Dividends and dividend equivalents declared on common stock and stock-based awards		(479,660)							(479,660)	[1]
Net income (loss) attributable to noncontrolling interests		(10,618)									10,618
Equity contributions from (distributions to) noncontrolling interests											(18,000)
End of period at Sep. 30, 2025		$ 14,996,579		$ 14,910,897	$ 1,802,480	$ 6,811	$ 27,352,976	$ (624,387)	$ (13,626,983)		$ 85,682

[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.