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This item represents the fair value of debt securities with an expected life of greater than ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

No definition available.

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This item represents debt securities, at cost, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any, with an expected life of greater than five years and less than ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

No definition available.

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This item represents the fair value of debt securities with an expected life of greater than five years and less than ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

No definition available.

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This item represents debt securities, at cost, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any, with an expected life of greater than one year and less than five years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

No definition available.

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This item represents the fair value of debt securities with an expected life of greater than one year and less than five years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

No definition available.

Name:	nly_AvailableForSaleSecuritiesDebtExpectedLifeGreaterThanOneAndLessThanFiveYearsFairValue
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This item represents debt securities, at cost, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any, with an expected life of less than one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

No definition available.

Name:	nly_AvailableForSaleSecuritiesDebtExpectedLifeOfLessThanOneYearAmortizedCost
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This item represents the fair value of debt securities with an expected life of less than one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

No definition available.

Name:	nly_AvailableForSaleSecuritiesDebtExpectedLifeOfLessThanOneYearFairValue
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- Details

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- Details

Name:	nly_MortgageBackedSecuritiesEstimatedWeightedAverageLifeFairValueAbstract
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Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 320

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=29643736&loc=d3e42546-110969