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

No definition available.

Name:	o_AcquiredPropertiesPercentageByTypeOfRealEstate
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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Properties Acquired With Settlement Credit

+ References

No definition available.

+ Details

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

- Definition

Real Estate Property Investments, Number Of Properties Under Development

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No definition available.

+ Details

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

- Definition

Real Estate Property Investments, Value Of Properties Acquired

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No definition available.

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

- Definition

Rental Revenue Generated From Acquisitions, Investment Grade Tenants, Percentage

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No definition available.

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Name:	o_RentalRevenueGeneratedFromAcquisitionsInvestmentGradeTenantsPercentage
Namespace Prefix:	o_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Settlement Credits For Acquired Properties As Reimbursement For Rent Free Period

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No definition available.

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

- 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.

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No definition available.

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

- Details

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

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_RetailSiteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_IndustrialPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Investments in Real Estate - Acquisitions Footnotes (Details) $ in Thousands, £ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) property	Dec. 31, 2021 GBP (£) property	Dec. 31, 2020 USD ($)	Dec. 31, 2020 GBP (£)
Real Estate [Line Items]
Settlement credits as reimbursement for acquired rent free period	$ 8,500
Number of properties related to settlement credits \| property	41	41
Investment	$ 6,410,760		$ 2,307,281
Rental revenue generated from acquisitions from investment grade clients (percent)	40.00%	40.00%	61.00%	61.00%
Properties under development
Real Estate [Line Items]
Number of properties, under development \| property	68	68
Investment	$ 243,278
Retail
Real Estate [Line Items]
Property type acquired based on rental revenue (percent)	83.60%	83.60%	86.60%	86.60%
Industrial
Real Estate [Line Items]
Property type acquired based on rental revenue (percent)	16.40%	16.40%	13.40%	13.40%
U.K.
Real Estate [Line Items]
Investment \| £				£ 707.8
U.K. \| Properties under development
Real Estate [Line Items]
Investment \| £		£ 7.0