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DERIVATIVE INSTRUMENTS - Narrative (Details) - USD ($) $ in Billions	Sep. 30, 2022	Dec. 31, 2021
Interest rate swaps, at fair value
Derivative [Line Items]
Variation margin	$ (3.2)	$ (0.4)

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- Definition

Derivative Instruments, Variation Margin on Collateral

+ References

No definition available.

+ Details

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Namespace Prefix:	nly_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- 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_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: