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DESCRIPTION OF BUSINESS (Details) | Jun. 30, 2025 investmentGroup
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Accounting Policies [Abstract] |
Number of investment groups | 3

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- Definition Number Of Investment Groups + References No definition available. + Details
Name: | nly_NumberOfInvestmentGroups
Namespace Prefix: | nly_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration