Name:	o_AcquiredPropertiesInvestmentsToTenantAsPercentageOfTotalAssets
Namespace Prefix:	o_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the portion of real estate properties leased during the period with existing tenant lease agreements in place expressed as a percentage of total area.

No definition available.

Name:	o_AcquiredPropertiesLeasedPercentage
Namespace Prefix:	o_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The number of states in which the real estate properties acquired during the period operate.

No definition available.

Name:	o_AcquiredPropertiesLocationInNumberOfStates
Namespace Prefix:	o_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of industries in which tenants of the real estate properties acquired during the period operate.

No definition available.

Name:	o_AcquiredPropertiesNumberOfIndustriesInWhichTenantsOperate
Namespace Prefix:	o_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of the real estate properties acquired during the period by the type of real estate.

No definition available.

Name:	o_AcquiredPropertiesPercentageByTypeOfRealEstate
Namespace Prefix:	o_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

For new properties during the period, the weighted average contractual lease rate computed as estimated contractual net operating income (in a net-leased property that is equal to the aggregate base rent or, in the case of properties under development, the estimated aggregate base rent under the lease) for the first year of each lease, divided by the estimated total cost of the properties.

No definition available.

Name:	o_AcquiredPropertiesWeightedAverageContractualLeaseRate
Namespace Prefix:	o_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Average period of time covered by real estate lease contracts.

No definition available.

Name:	o_AverageLeaseTerm
Namespace Prefix:	o_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The increase in amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

No definition available.

Name:	o_IncreaseDecreaseDebtInstrumentUnamortizedDiscountPremium
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the buildings and improvements recorded as part of the real estate acquisition.

No definition available.

Name:	o_RealEstatePropertiesAcquiredBuildingsAndImprovements
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the Intangible and assumed liabilities recorded as part of the real estate acquisition.

No definition available.

Name:	o_RealEstatePropertiesAcquiredIntangibleAndAssumedLiabilities
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the intangible assets recorded as part of the real estate acquisition.

No definition available.

Name:	o_RealEstatePropertiesAcquiredIntangibleAssets
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the land recorded as part of the real estate acquisition.

No definition available.

Name:	o_RealEstatePropertiesAcquiredLand
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the estimated fair value of the purchase price allocation.

No definition available.

Name:	o_RealEstatePropertiesAcquiredPurchasePriceAllocationEstimate
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the estimated fair value of the purchase price allocation that was finalized during the period.

No definition available.

Name:	o_RealEstatePropertiesAcquiredPurchasePriceAllocationFinalized
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the direct costs incurred in the acquisition of real estate properties, including legal, accounting and other costs.

No definition available.

Name:	o_RealEstatePropertyAcquisitionsTransactionCosts
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the number of investments in properties that caused any tenant to be 10 percent or more of total assets.

No definition available.

Name:	o_RealEstatePropertyInvestmentsNumberOfInvestmentsThatCausedAnyOneTenantToBeTenPercentOrMoreOfTotalAssets
Namespace Prefix:	o_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of new properties and properties under development in which the entity invested during the period.

No definition available.

Name:	o_RealEstatePropertyInvestmentsNumberOfNewPropertiesAndPropertiesUnderDevelopment
Namespace Prefix:	o_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the value of real estate acquired during the period.

No definition available.

Name:	o_RealEstatePropertyInvestmentsValueOfNewProperties
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Area of a real estate property.

No definition available.

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

Amount of liability recognized arising from contingent consideration in a business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

Name:	us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The aggregate costs related to construction and development services during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4K
-URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684

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

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.

No definition available.

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

The aggregate revenue from real estate operations during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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

Name:	us-gaap_InvestmentTypeAxis=us-gaap_RealEstateInvestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=o_PropertiesNewAndUnderDevelopmentOrExpansionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=o_PropertiesNewMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_RetailSiteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_IndustrialPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=o_PropertiesUnderDevelopmentOrExpansionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: