Merger with VEREIT, Inc. - Fair Value of Consideration (Details) - USD ($) $ / shares in Units, $ in Thousands	Nov. 01, 2021	Mar. 31, 2022	Dec. 31, 2021
Fair value of the consideration transferred on the date of the acquisition
Common stock and paid in capital, outstanding (in shares)		601,566,581	591,261,991
VEREIT
Fair value of the consideration transferred on the date of the acquisition
Shares of VEREIT common stock and VEREIT OP common units exchanged (in shares)	229,304,035
Exchange Ratio	70.50%
Shares of VEREIT common stock and VEREIT OP common units after conversion (in shares)	161,659,345
Less: Fractional shares settled in cash (in shares)	(1,545)
Shares of Realty Income common stock and Realty Income L.P. units issued (in shares)	161,657,800
Adjusted opening price of Realty common stock on November 1, 2021 (in dollars per share)	$ 71.236
Fair value of Realty common stock issued to former holders of VEREIT common stock and VEREIT OP common units	$ 11,515,855
Fair value of VEREIT's equity-based compensation awards attributable to pre-combination services	44,020
Total non-cash consideration	11,559,875
Cash paid for fractional shares	110
VEREIT indebtedness paid off in connection with the merger	500,414
Consideration transferred	$ 12,060,399
VEREIT Inc
Fair value of the consideration transferred on the date of the acquisition
Common stock and paid in capital, outstanding (in shares)	229,152,001
VEREIT OP
Fair value of the consideration transferred on the date of the acquisition
Common units outstanding (in units)	152,034
Realty Income
Fair value of the consideration transferred on the date of the acquisition
Share price (in dollars per share)	$ 71.00
Dividend adjustment on share price (in dollars per share)	$ 0.236