XML 124 R75.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

VARIABLE INTEREST ENTITIES - Schedule of the Fair Value of OBX Trusts Closed (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Oct. 31, 2019 | Jul. 31, 2019 | Jun. 30, 2019 | Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Mar. 31, 2018
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Loans | $ 669,713 |  |  |  |  |  |  |  |
OBX Trust | Consolidated VIEs |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Loans |  | $ 465,492 | $ 463,405 | $ 383,760 | $ 388,156 | $ 393,961 | $ 384,027 | $ 383,451 | $ 327,162

X
- Definition Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column G)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
Name: | us-gaap_MortgageLoansOnRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=nly_OBXTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |