XML 72 R54.htm IDEA: XBRL DOCUMENT v3.24.0.1

SECURITIES - Summary of Residential Securities and CMBS (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Debt Securities, Available-For-Sale [Roll Forward]
Beginning balance January 1, 2023	$ 65,789,907	[1]
Purchases	43,711,056
Sales	(36,832,093)
Principal paydowns	(6,152,666)
(Amortization) / accretion	(163,886)
Fair value adjustment	3,261,247
Ending balance December 31, 2023	69,613,565	[1]
Agency Securities
Debt Securities, Available-For-Sale [Roll Forward]
Beginning balance January 1, 2023	62,274,895
Purchases	42,728,938
Sales	(35,733,141)
Principal paydowns	(5,843,220)
(Amortization) / accretion	(186,553)
Fair value adjustment	3,067,869
Ending balance December 31, 2023	66,308,788
Residential Credit Securities
Debt Securities, Available-For-Sale [Roll Forward]
Beginning balance January 1, 2023	2,988,703
Purchases	905,952
Sales	(706,750)
Principal paydowns	(303,908)
(Amortization) / accretion	21,396
Fair value adjustment	176,940
Ending balance December 31, 2023	3,082,333
Commercial mortgage-backed securities
Debt Securities, Available-For-Sale [Roll Forward]
Beginning balance January 1, 2023	526,309
Purchases	76,166
Sales	(392,202)
Principal paydowns	(5,538)
(Amortization) / accretion	1,271
Fair value adjustment	16,438
Ending balance December 31, 2023	$ 222,444
[1] (2) Excludes $1.5 billion and $1.0 billion at December 31, 2023 and 2022, respectively, of non-Agency mortgage-backed securities in consolidated VIEs pledged as collateral and eliminated from the Company’s Consolidated Statements of Financial Condition.

X

- Definition

Accretion (Amortization) Of Debt Securities Available-For-Sale

+ References

No definition available.

+ Details

Name:	nly_AccretionAmortizationOfDebtSecuritiesAvailableForSale
Namespace Prefix:	nly_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Debt Securities, Available-For-Sale [Roll Forward]

+ References

No definition available.

+ Details

Name:	nly_DebtSecuritiesAvailableForSaleRollForward
Namespace Prefix:	nly_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Payments to Acquire Debt Securities, Available-for-sale, Excluding Variable Interest Entity

+ References

No definition available.

+ Details

Name:	nly_PaymentstoAcquireDebtSecuritiesAvailableforsaleExcludingVariableInterestEntity
Namespace Prefix:	nly_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Proceeds from Sale of Debt Securities, Available-for-sale, Excluding Variable Interest Entity

+ References

No definition available.

+ Details

Name:	nly_ProceedsfromSaleofDebtSecuritiesAvailableforsaleExcludingVariableInterestEntity
Namespace Prefix:	nly_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, after tax and adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 10A
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 10A
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-11

+ Details

Name:	us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-11

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-12

+ Details

Name:	us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_AgencySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: