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COVER PAGE - USD ($) $ in Billions	12 Months Ended
COVER PAGE - USD ($) $ in Billions	Dec. 31, 2019	Jan. 31, 2020	Jun. 30, 2019
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Document Transition Report	false
Entity File Number	1-13447
Entity Registrant Name	ANNALY CAPITAL MANAGEMENT INC
Entity Central Index Key	0001043219
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	22-3479661
Entity Address, Address Line One	1211 Avenue of the Americas
Entity Address, City or Town	New York,
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10036
City Area Code	212
Local Phone Number	696-0100
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 13.3
Entity Common Stock, Shares Outstanding		1,430,324,298
Documents Incorporated by Reference	The registrant intends to file a definitive proxy statement pursuant to Regulation 14A within 120 days of the end of the fiscal year ended December 31, 2019. Portions of such proxy statement are incorporated by reference into Part III of this Form 10-K.
Common Stock, par value $0.01 per share
Document Information [Line Items]
Title of Each Class	Common Stock, par value $0.01 per share
Trading Symbol	NLY
Name of Each Exchange on Which Registered	NYSE
7.50% Series D Cumulative Redeemable Preferred Stock
Document Information [Line Items]
Title of Each Class	7.50% Series D Cumulative Redeemable Preferred Stock
Trading Symbol	NLY.D
Name of Each Exchange on Which Registered	NYSE
6.95% Series F Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock
Document Information [Line Items]
Title of Each Class	6.95% Series F Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock
Trading Symbol	NLY.F
Name of Each Exchange on Which Registered	NYSE
6.50% Series G Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock
Document Information [Line Items]
Title of Each Class	6.50% Series G Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock
Trading Symbol	NLY.G
Name of Each Exchange on Which Registered	NYSE
6.75% Series I Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock
Document Information [Line Items]
Title of Each Class	6.75% Series I Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock
Trading Symbol	NLY.I
Name of Each Exchange on Which Registered	NYSE