Business Combination, Potential Success Fees Upon Closing Of Merger

No definition available.

Name:	o_BusinessCombinationPotentialSuccessFeesUponClosingOfMerger
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Litigation, Number Of Lawsuits Filed To Date

+ References

No definition available.

+ Details

Name:	o_LitigationNumberOfLawsuitsFiledToDate
Namespace Prefix:	o_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Merger Agreement, Conversion Metric For Outstanding Common Shares

+ References

No definition available.

+ Details

Name:	o_MergerAgreementConversionMetricForOutstandingCommonShares
Namespace Prefix:	o_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Merger Agreement, Number Of Newly Formed Subsidiaries

+ References

No definition available.

+ Details

Name:	o_MergerAgreementNumberOfNewlyFormedSubsidiaries
Namespace Prefix:	o_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Shares Of Newly Formed Subsidiary Received For Ten Shares Of Parent Company

+ References

No definition available.

+ Details

Name:	o_NumberOfSharesOfNewlyFormedSubsidiaryReceivedForTenSharesOfParentCompany
Namespace Prefix:	o_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- 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

No definition available.

+ Details

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

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460

+ Details

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

- Definition

Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Details

Name:	srt_CounterpartyNameAxis=o_VEREITIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=o_OrionOfficeREITMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=o_MergerRelatedLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=o_MergerDisclosuresVEREITPurportedStockholdersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=o_MergerDisclosuresRealtyIncomeCorpPurportedStockholdersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Agreement and Plan of Merger (Details)	3 Months Ended		9 Months Ended
Agreement and Plan of Merger (Details)	Sep. 30, 2021 USD ($) lawsuit	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) lawsuit	Sep. 30, 2020 USD ($)	Nov. 01, 2021 Rate shares	Apr. 29, 2021 subsidiary
Business Acquisition [Line Items]
Merger-related costs	$ 16,783,000	$ 0	$ 30,081,000	$ 0
Potential success fees upon closing of merger	19,000,000		19,000,000
VEREIT Inc
Business Acquisition [Line Items]
Newly formed subsidiaries \| subsidiary						2
VEREIT Inc \| Subsequent event
Business Acquisition [Line Items]
Conversion for common stock and common units per merger agreement \| Rate					70.50%
Orion \| Subsequent event
Business Acquisition [Line Items]
Number of shares of newly formed subsidiary to be received for 10 shares of Company stock \| shares					1
Merger-related litigation
Business Acquisition [Line Items]
Accrual for merger-related litigation matters	$ 0		$ 0
Disclosure challenges, purported stockholders of VEREIT
Business Acquisition [Line Items]
Number of lawsuits filed to date \| lawsuit	12		12
Disclosure challenges, purported stockholders of Realty Income
Business Acquisition [Line Items]
Number of lawsuits filed to date \| lawsuit	1		1