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				0	315	673,378
Acquisition of subsidiary					3	17,693
Unrealized gains (losses) on available-for-sale securities		$ 580,680					580,680
Reclassification adjustment for net (gains) losses included in net income (loss)		1,792,816					1,792,816
Net income (loss) attributable to Annaly		(1,643,171)						(1,643,171)
Dividends declared on preferred stock	[1]							(141,676)
Dividends and dividend equivalents declared on common stock and stock-based awards	[1]							(1,294,688)
Net income (loss) attributable to noncontrolling interests		(4,714)								4,714
Equity contributions from (distributions to) noncontrolling interests										(14,399)
End of period at Dec. 31, 2023		11,345,091	$ 11,255,793	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	780	1,557,536
Acquisition of subsidiary					3	27,789
Unrealized gains (losses) on available-for-sale securities		(244,278)					(244,278)
Reclassification adjustment for net (gains) losses included in net income (loss)		561,996					561,996
Net income (loss) attributable to Annaly		1,001,906						1,001,906
Dividends declared on preferred stock	[1]							(154,551)
Dividends and dividend equivalents declared on common stock and stock-based awards		(1,397,733)						(1,397,733)	[1]
Net income (loss) attributable to noncontrolling interests		(9,862)								9,862
Equity contributions from (distributions to) noncontrolling interests										(11,449)
End of period at Dec. 31, 2024		12,696,952	12,609,241	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	1,280	2,643,380
Acquisition of subsidiary					6	26,017
Unrealized gains (losses) on available-for-sale securities		386,709					386,709
Reclassification adjustment for net (gains) losses included in net income (loss)		142,407					142,407
Net income (loss) attributable to Annaly		2,027,262						2,027,262
Dividends declared on preferred stock	[1]							(157,931)
Dividends and dividend equivalents declared on common stock and stock-based awards		(1,853,510)						(1,853,510)	[1]
Net income (loss) attributable to noncontrolling interests		(24,428)								24,428
Equity contributions from (distributions to) noncontrolling interests										(43,000)
End of period at Dec. 31, 2025		$ 16,159,911	$ 16,090,772	$ 1,802,480	$ 7,070	$ 27,927,113	$ (488,566)	$ (13,157,325)		$ 69,139

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