CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net interest income
Interest income	$ 2,778,887	$ 1,983,036	$ 2,229,625
Interest expense	1,309,735	249,243	899,112
Net interest income	1,469,152	1,733,793	1,330,513
Net servicing income
Servicing and related income	246,926	69,018	94,190
Servicing and related expense	25,145	12,202	26,437
Net servicing income	221,781	56,816	67,753
Realized and unrealized gains (losses)
Net gains (losses) on investments and other	(4,602,456)	120,958	358,489
Net gains (losses) on derivatives	4,859,174	807,730	(2,273,732)
Loan loss (provision) reversal	20,660	145,066	(147,581)
Business divestiture-related gains (losses)	(40,258)	(278,559)	0
Other, net	6,667	1,165	(31,442)
Total other income (loss)	243,787	796,360	(2,094,266)
General and administrative expenses
Compensation and management fee	112,703	118,451	131,685
Other general and administrative expenses	50,026	67,563	90,510
Total general and administrative expenses	162,729	186,014	222,195
Income (loss) before income taxes	1,771,991	2,400,955	(918,195)
Income taxes	45,571	4,675	(28,423)
Net income (loss)	1,726,420	2,396,280	(889,772)
Net income (loss) attributable to noncontrolling interests	1,095	6,384	1,391
Net income (loss) attributable to Annaly	1,725,325	2,389,896	(891,163)
Dividends on preferred stock	110,623	107,532	142,036
Net income (loss) available (related) to common stockholders	$ 1,614,702	$ 2,282,364	$ (1,033,199)
Net income (loss) per share available (related) to common stockholders
Basic (in dollars per share)	$ 3.93	$ 6.40	$ (2.92)
Diluted (in dollars per share)	$ 3.92	$ 6.39	$ (2.92)
Weighted average number of common shares outstanding
Basic (in shares)	411,348,484	356,856,520	353,664,860
Diluted (in shares)	411,621,758	357,142,251	353,664,860
Other comprehensive income (loss)
Net income (loss)	$ 1,726,420	$ 2,396,280	$ (889,772)
Unrealized gains (losses) on available-for-sale securities	(8,204,542)	(2,419,618)	2,012,878
Reclassification adjustment for net (gains) losses included in net income (loss)	3,537,236	3,693	(776,734)
Other comprehensive income (loss)	(4,667,306)	(2,415,925)	1,236,144
Comprehensive income (loss)	(2,940,886)	(19,645)	346,372
Comprehensive income (loss) attributable to noncontrolling interests	1,095	6,384	1,391
Comprehensive income (loss) attributable to Annaly	(2,941,981)	(26,029)	344,981
Comprehensive income (loss) attributable to common stockholders	$ (3,052,604)	$ (133,561)	$ 202,945