Summary of Significant Accounting Policies and Procedures and New Accounting Standards (Policies)	3 Months Ended
Mar. 31, 2022
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation. These consolidated financial statements include the accounts of Realty Income and all other entities in which we have a controlling financial interest. We evaluate whether we have a controlling financial interest in an entity in accordance with Accounting Standards Codification (“ASC”) 810, Consolidation. Voting interest entities are entities considered to have sufficient equity at risk and which the equity holders have the obligation to absorb losses, the right to receive residual returns and the right to make decisions about the entity’s activities. We consolidate voting interest entities in which we have a controlling financial interest, which we typically have through holding of a majority of the entity’s voting equity interests. The portion of a consolidated entity not owned by us is recorded as a noncontrolling interest. Noncontrolling interests are reflected on our consolidated balance sheets as a component of equity. Noncontrolling interest that was created or assumed as part of a business combination or asset acquisition was recognized at fair value as of the date of the transaction (see note 11, Noncontrolling Interests).
Principles of Consolidation, Variable Interest Entities	Variable interest entities (“VIEs”) are entities that lack sufficient equity at risk or where the equity holders either do not have the obligation to absorb losses, do not have the right to receive residual returns, do not have the right to make decisions about the entity’s activities, or some combination of the above. A controlling financial interest in a VIE is present when an entity has a variable interest, or a combination of variable interests, that provides the entity with (i) the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. An entity that meets both conditions above is deemed the primary beneficiary and consolidates the VIE. We reassess our initial evaluation of whether an entity is a VIE when certain reconsideration events occur. We reassess our determination of whether we are the primary beneficiary of a VIE on an ongoing basis based on current facts and circumstances.
Income Taxes	Income Taxes. We have elected to be taxed as a real estate investment trust, or REIT, under the Internal Revenue Code of 1986, as amended. We believe we have qualified and continue to qualify as a REIT. Under the REIT operating structure, we are permitted to deduct dividends paid to our stockholders in determining our taxable income. Assuming our dividends equal or exceed our taxable net income, we generally will not be required to pay federal corporate income taxes on such income. Accordingly, no provision has been made for federal income taxes in the accompanying consolidated financial statements, except for federal income taxes of our taxable REIT subsidiaries.
Lease Revenue Recognition and Accounts Receivable	Lease Revenue Recognition and Accounts Receivable. The COVID-19 pandemic and the measures taken to limit its spread have negatively impacted the economy across many industries, including the industries in which some of our clients operate. These impacts may continue as the duration and severity of the pandemic increases. As a result, we have closely monitored the collectability of our accounts receivable and continue to evaluate the potential impacts of the COVID-19 pandemic and the measures taken to limit its spread on our business and industry segments as the situation continues to evolve and more information becomes available. We continue to assess the probability of collecting substantially all of the lease payments to which we are entitled under the original lease contract as required under Topic 842, Leases. We assess the collectability of our future lease payments based on an analysis of creditworthiness, economic trends (including trends arising from the COVID-19 pandemic) and other facts and circumstances related to the applicable clients. If we conclude the collection of substantially all lease payments under a lease is less than probable, rental revenue recognized for that lease is limited to cash received going forward, existing operating lease receivables, including those related to straight-line rental revenue, must be written off as an adjustment to rental revenue, and no further operating lease receivables are recorded for that lease until such future determination is made that substantially all lease payments under that lease are now considered probable. If we subsequently conclude that the collection of substantially all lease payments under a lease is probable, a reversal of lease receivables previously written off is recognized. The majority of concessions granted to our clients as a result of the COVID-19 pandemic have been rent deferrals with the original lease term unchanged. In accordance with the guidance provided by the Financial Accounting Standards Board (FASB) staff, we have elected to account for these leases as if the right of deferral existed in the lease contract and therefore continue to recognize lease revenue in accordance with the lease contract in effect. In limited circumstances, the undiscounted cash flows resulting from deferrals granted increased significantly from original lease terms, which required us to account for these as lease modifications and resulted in an insignificant impact to consolidated rental revenue. Similarly, rent abatements granted, which are also accounted for as lease modifications, have impacted our rental revenue by an insignificant amount. As of March 31, 2022, other than the information related to the reserves recorded to date, we do not have any further client specific information that would change our assessment that collection of substantially all of the future lease payments under our existing leases is probable. However, since the conversations regarding rent collections for our clients affected by the COVID-19 pandemic are ongoing and we do not currently know the types of future concessions, if any, that will ultimately be granted, there may be impacts in future periods that could change this assessment as the situation continues to evolve and as more information becomes available.
Investment in Unconsolidated Entities	Investment in Unconsolidated Entities. We account for our investment in unconsolidated entity arrangements using the equity method of accounting as we have the ability to exercise significant influence, but not control, over operating and financing policies of these investments. We have determined that none of the unconsolidated entities would be considered VIEs under the applicable accounting guidance. Our equity method investments were acquired in our merger with VEREIT. As a result, the investments were recorded at fair value and subsequently will be adjusted for our share of equity in the entities' earnings and distributions received. The step-up in fair value was allocated to the individual investment assets and liabilities and is being amortized over the estimated useful life of the respective underlying tangible real estate assets, the lease term of the intangible real estate assets, and the remaining term of the assumed debt. Investment in unconsolidated entities is included in the accompanying consolidated balance sheets. We record our proportionate share of net income from the unconsolidated entities in other income, net in the consolidated statements of income and comprehensive income.
Newly Issued Accounting Standards	Newly Issued Accounting Standards. In July 2021, the FASB issued ASU 2021-05 establishing Topic 842, Lessors - Certain Leases with Variable Lease Payments. ASU 2021-05 improves ASC 842 classification guidance as it relates to a lessor's accounting for certain leases with variable lease payments. This guidance requires a lessor to classify a lease with variable payments that do not depend on an index or rate as an operating lease if either a sales-type lease or direct financing lease classification would trigger a day-one loss. This guidance is effective for reporting periods beginning after December 15, 2021, with early adoption permitted. The adoption of this guidance did not have a material impact on our consolidated financial statements.In March 2020, the FASB issued ASU 2020-04 establishing Topic 848, Reference Rate Reform. ASU 2020-04 contains practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance is optional and is effective between March 12, 2020, and December 31, 2022. The guidance may be elected over time as reference rate reform activities occur. We are currently evaluating the impact that the expected market transition from LIBOR to alternative references rates will have on our financial statements as well as the applicability of the aforementioned expedients and exceptions provided in ASU 2020-04.

Summary of Significant Accounting Policies and Procedures and New Accounting Standards (Policies)

3 Months Ended

Mar. 31, 2022

Principles of Consolidation. These consolidated financial statements include the accounts of Realty Income and all other entities in which we have a controlling financial interest. We evaluate whether we have a controlling financial interest in an entity in accordance with Accounting Standards Codification (“ASC”) 810, Consolidation.

Voting interest entities are entities considered to have sufficient equity at risk and which the equity holders have the obligation to absorb losses, the right to receive residual returns and the right to make decisions about the entity’s activities. We consolidate voting interest entities in which we have a controlling financial interest, which we typically have through holding of a majority of the entity’s voting equity interests.

The portion of a consolidated entity not owned by us is recorded as a noncontrolling interest. Noncontrolling interests are reflected on our consolidated balance sheets as a component of equity. Noncontrolling interest that was created or assumed as part of a business combination or asset acquisition was recognized at fair value as of the date of the transaction (see note 11, Noncontrolling Interests).

Principles of Consolidation, Variable Interest Entities

Variable interest entities (“VIEs”) are entities that lack sufficient equity at risk or where the equity holders either do not have the obligation to absorb losses, do not have the right to receive residual returns, do not have the right to make decisions about the entity’s activities, or some combination of the above. A controlling financial interest in a VIE is present when an entity has a variable interest, or a combination of variable interests, that provides the entity with (i) the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. An entity that meets both conditions above is deemed the primary beneficiary and consolidates the VIE. We reassess our initial evaluation of whether an entity is a VIE when certain reconsideration events occur. We reassess our determination of whether we are the primary beneficiary of a VIE on an ongoing basis based on current facts and circumstances.

Income Taxes

Income Taxes. We have elected to be taxed as a real estate investment trust, or REIT, under the Internal Revenue Code of 1986, as amended. We believe we have qualified and continue to qualify as a REIT. Under the REIT operating structure, we are permitted to deduct dividends paid to our stockholders in determining our taxable income. Assuming our dividends equal or exceed our taxable net income, we generally will not be required to pay federal corporate income taxes on such income. Accordingly, no provision has been made for federal income taxes in the accompanying consolidated financial statements, except for federal income taxes of our taxable REIT subsidiaries.

Lease Revenue Recognition and Accounts Receivable

Lease Revenue Recognition and Accounts Receivable. The COVID-19 pandemic and the measures taken to limit its spread have negatively impacted the economy across many industries, including the industries in which some of our clients operate. These impacts may continue as the duration and severity of the pandemic increases. As a result, we have closely monitored the collectability of our accounts receivable and continue to evaluate the potential impacts of the COVID-19 pandemic and the measures taken to limit its spread on our business and industry segments as the situation continues to evolve and more information becomes available.

We continue to assess the probability of collecting substantially all of the lease payments to which we are entitled under the original lease contract as required under Topic 842, Leases. We assess the collectability of our future lease payments based on an analysis of creditworthiness, economic trends (including trends arising from the COVID-19 pandemic) and other facts and circumstances related to the applicable clients. If we conclude the collection of substantially all lease payments under a lease is less than probable, rental revenue recognized for that lease is limited to cash received going forward, existing operating lease receivables, including those related to straight-line rental revenue, must be written off as an adjustment to rental revenue, and no further operating lease receivables are recorded for that lease until such future determination is made that substantially all lease payments under that lease are now considered probable. If we subsequently conclude that the collection of substantially all lease payments under a lease is probable, a reversal of lease receivables previously written off is recognized.

The majority of concessions granted to our clients as a result of the COVID-19 pandemic have been rent deferrals with the original lease term unchanged. In accordance with the guidance provided by the Financial Accounting Standards Board (FASB) staff, we have elected to account for these leases as if the right of deferral existed in the lease contract and therefore continue to recognize lease revenue in accordance with the lease contract in effect. In limited circumstances, the undiscounted cash flows resulting from deferrals granted increased significantly from original lease terms, which required us to account for these as lease modifications and resulted in an insignificant impact to consolidated rental revenue. Similarly, rent abatements granted, which are also accounted for as lease modifications, have impacted our rental revenue by an insignificant amount.

As of March 31, 2022, other than the information related to the reserves recorded to date, we do not have any further client specific information that would change our assessment that collection of substantially all of the future lease payments under our existing leases is probable. However, since the conversations regarding rent collections for our clients affected by the COVID-19 pandemic are ongoing and we do not currently know the types of future concessions, if any, that will ultimately be granted, there may be impacts in future periods that could change this assessment as the situation continues to evolve and as more information becomes available.

Investment in Unconsolidated Entities

Investment in Unconsolidated Entities. We account for our investment in unconsolidated entity arrangements using the equity method of accounting as we have the ability to exercise significant influence, but not control, over operating and financing policies of these investments. We have determined that none of the unconsolidated entities would be considered VIEs under the applicable accounting guidance. Our equity method investments were acquired in our merger with VEREIT. As a result, the investments were recorded at fair value and subsequently will be adjusted for our share of equity in the entities' earnings and distributions received. The step-up in fair value was allocated to the individual investment assets and liabilities and is being amortized over the estimated useful life of the respective underlying tangible real estate assets, the lease term of the intangible real estate assets, and the remaining term of the assumed debt. Investment in unconsolidated entities is included in the accompanying consolidated balance sheets. We record our proportionate share of net income from the unconsolidated entities in other income, net in the consolidated statements of income and comprehensive income.

Newly Issued Accounting Standards

Newly Issued Accounting Standards. In July 2021, the FASB issued ASU 2021-05 establishing Topic 842, Lessors - Certain Leases with Variable Lease Payments. ASU 2021-05 improves ASC 842 classification guidance as it relates to a lessor's accounting for certain leases with variable lease payments. This guidance requires a lessor to classify a lease with variable payments that do not depend on an index or rate as an operating lease if either a sales-type lease or direct financing lease classification would trigger a day-one loss. This guidance is effective for reporting periods beginning after December 15, 2021, with early adoption permitted. The adoption of this guidance did not have a material impact on our consolidated financial statements.In March 2020, the FASB issued ASU 2020-04 establishing Topic 848, Reference Rate Reform. ASU 2020-04 contains practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance is optional and is effective between March 12, 2020, and December 31, 2022. The guidance may be elected over time as reference rate reform activities occur. We are currently evaluating the impact that the expected market transition from LIBOR to alternative references rates will have on our financial statements as well as the applicability of the aforementioned expedients and exceptions provided in ASU 2020-04.