XML 57 R45.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

DESCRIPTION OF BUSINESS (Details) | Mar. 31, 2024 investmentGroup
--- | ---
Accounting Policies [Abstract] |
Number of investment groups | 3

X
- 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

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