CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Net interest income
Interest income	$ 5,959,205	$ 4,840,034	$ 3,731,581
Interest expense	4,823,705	4,592,238	3,842,965
Net interest income	1,135,500	247,796	(111,384)
Net servicing income
Servicing and related income	579,592	485,406	364,157
Servicing and related expense	60,273	49,469	37,652
Net servicing income	519,319	435,937	326,505
Other income (loss)
Net gains (losses) on investments and other	1,745,670	(1,849,585)	(2,125,618)
Net gains (losses) on derivatives	(1,207,161)	2,269,301	400,092
Loan loss (provision) reversal	0	0	219
Other, net	51,121	94,935	73,716
Total other income (loss)	589,630	514,651	(1,651,591)
General and administrative expenses
Compensation expense	151,552	130,403	119,592
Other general and administrative expenses	48,077	40,953	42,961
Total general and administrative expenses	199,629	171,356	162,553
Income (loss) before income taxes	2,044,820	1,027,028	(1,599,023)
Income taxes	(6,870)	15,260	39,434
Net income (loss)	2,051,690	1,011,768	(1,638,457)
Net income (loss) attributable to noncontrolling interests	24,428	9,862	4,714
Net income (loss) attributable to Annaly	2,027,262	1,001,906	(1,643,171)
Dividends on preferred stock	157,931	154,551	141,676
Net income (loss) available (related) to common stockholders	$ 1,869,331	$ 847,355	$ (1,784,847)
Net income (loss) per share available (related) to common stockholders
Basic (in dollars per share)	$ 2.92	$ 1.62	$ (3.61)
Diluted (in dollars per share)	$ 2.92	$ 1.62	$ (3.61)
Weighted average number of common shares outstanding
Basic (in shares)	639,513,399	521,737,554	494,541,323
Diluted (in shares)	641,042,741	522,747,610	494,541,323
Other comprehensive income (loss)
Net income (loss)	$ 2,051,690	$ 1,011,768	$ (1,638,457)
Unrealized gains (losses) on available-for-sale securities	386,709	(244,278)	580,680
Reclassification adjustment for net (gains) losses included in net income (loss)	142,407	561,996	1,792,816
Other comprehensive income (loss)	529,116	317,718	2,373,496
Comprehensive income (loss)	2,580,806	1,329,486	735,039
Comprehensive income (loss) attributable to noncontrolling interests	24,428	9,862	4,714
Comprehensive income (loss) attributable to Annaly	2,556,378	1,319,624	730,325
Comprehensive income (loss) attributable to common stockholders	$ 2,398,447	$ 1,165,073	$ 588,649