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Real Estate (Key Information for Leases) (Details) | 9 Months Ended
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Sep. 30, 2024 Property
Lessor, Lease, Description [Line Items] |
Weighted average remaining lease term (years) | 10 years
Leases classified as operating leases | 3,541
Leases classified as direct financing leases | 4
Minimum |
Lessor, Lease, Description [Line Items] |
Initial lease term | 10 years
Maximum |
Lessor, Lease, Description [Line Items] |
Initial lease term | 20 years

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- Definition Lessor, Lease, Term Of Contract + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Number of Investment Properties leased under the direct financing method + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Total number of Investment Properties leased under operating leases + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Weighted Average Remaining Lease Term + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479773/842-30-50-3 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |