CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net interest income
Interest income		$ 562,443	$ 919,299	$ 1,702,281	$ 2,713,083
Interest expense		115,126	766,905	804,631	2,164,817
Net interest income		447,317	152,394	897,650	548,266
Realized and unrealized gains (losses)
Net interest component of interest rate swaps		(62,529)	88,466	(141,070)	306,154
Realized gains (losses) on termination or maturity of interest rate swaps		(427)	(682,602)	(1,919,720)	(1,438,349)
Unrealized gains (losses) on interest rate swaps		170,327	(326,309)	(1,162,768)	(1,992,884)
Subtotal		107,371	(920,445)	(3,223,558)	(3,125,079)
Net gains (losses) on disposal of investments and other		198,888	66,522	652,150	(65,727)
Net gains (losses) on other derivatives		169,316	(16,888)	546,658	(638,458)
Net unrealized gains (losses) on instruments measured at fair value through earnings		121,255	(1,091)	(354,133)	41,657
Loan loss provision		21,993	(3,504)	(146,084)	(9,207)
Subtotal		511,452	45,039	698,591	(671,735)
Total realized and unrealized gains (losses)		618,823	(875,406)	(2,524,967)	(3,796,814)
Other income (loss)		7,959	35,074	38,109	93,757
General and administrative expenses
Compensation and management fee		29,196	41,161	107,057	130,225
Other general and administrative expenses		19,636	24,977	87,070	98,058
Total general and administrative expenses		48,832	66,138	194,127	228,283
Income (loss) before income taxes		1,025,267	(754,076)	(1,783,335)	(3,383,074)
Income taxes		9,719	(6,907)	(14,928)	(10,241)
Net income (loss)		1,015,548	(747,169)	(1,768,407)	(3,372,833)
Net income (loss) attributable to noncontrolling interests		(126)	(110)	(28)	(294)
Net income (loss) attributable to Annaly		1,015,674	(747,059)	(1,768,379)	(3,372,539)
Dividends on preferred stock (1)	[1]	35,509	36,151	106,527	101,067
Net income (loss) available (related) to common stockholders		$ 980,165	$ (783,210)	$ (1,874,906)	$ (3,473,606)
Net income (loss) per share available (related) to common stockholders
Basic (in dollars per share)		$ 0.70	$ (0.54)	$ (1.32)	$ (2.42)
Diluted (in dollars per share)		$ 0.70	$ (0.54)	$ (1.32)	$ (2.42)
Weighted average number of common shares outstanding
Basic (in shares)		1,404,202,695	1,453,359,211	1,419,645,475	1,436,204,582
Diluted (in shares)		1,404,368,300	1,453,359,211	1,419,645,475	1,436,204,582
Other comprehensive income (loss)
Net income (loss)		$ 1,015,548	$ (747,169)	$ (1,768,407)	$ (3,372,833)
Unrealized gains (losses) on available-for-sale securities		(140,671)	1,034,873	2,220,271	4,289,054
Reclassification adjustment for net (gains) losses included in net income (loss)		(112,347)	(86,061)	(769,406)	4,626
Other comprehensive income (loss)		(253,018)	948,812	1,450,865	4,293,680
Comprehensive income (loss)		762,530	201,643	(317,542)	920,847
Comprehensive income (loss) attributable to noncontrolling interests		(126)	(110)	(28)	(294)
Comprehensive income (loss) attributable to Annaly		762,656	201,753	(317,514)	921,141
Comprehensive income (loss) attributable to common stockholders		$ 727,147	$ 165,602	$ (424,041)	$ 820,074

[1] The three months ended September 30, 2019 exclude cumulative and undeclared dividends of $0.3 million on the Company's Series I Preferred Stock as of June 30, 2019.