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Business And Organization (Details)	3 Months Ended
Business And Organization (Details)	Mar. 31, 2022 project
Nature Of Operations [Abstract]
Number of real estate properties	104
Minimum percentage of taxable income distributed to shareholders	90.00%
BUSINESS AND ORGANIZATION	BUSINESS AND ORGANIZATION Federal Realty Investment Trust (the "Parent Company" and the “Trust”) is an equity real estate investment trust (“REIT”). Federal Realty OP LP (the "Operating Partnership") is the entity through which the Parent Company conducts substantially all of its operations and owns all of its assets. The Parent Company owns 100% of the limited liability company interests of, is sole member of and exercises exclusive control over Federal Realty GP LLC ("the General Partner"), which in turn, is the sole general partner of the Operating Partnership. The Parent Company specializes in the ownership, management, and redevelopment of retail and mixed-use properties through the Operating Partnership, and has no other substantial assets or liabilities other than through its investment in the Operating Partnership. Our properties are located primarily in communities where we believe retail demand exceeds supply, in strategically selected metropolitan markets in the Mid-Atlantic and Northeast regions of the United States, California, and South Florida. As of March 31, 2022, we owned or had a majority interest in community and neighborhood shopping centers and mixed-use properties which are operated as 104 predominantly retail real estate projects. We operate in a manner intended to enable the Trust to qualify as a REIT for federal income tax purposes. A REIT that distributes at least 90% of its taxable income to its shareholders each year and meets certain other conditions is not taxed on that portion of its taxable income which is distributed to its shareholders. Therefore, federal income taxes on our taxable income have been and are generally expected to be immaterial. We are obligated to pay state taxes, generally consisting of franchise or gross receipts taxes in certain states. Such state taxes also have not been material.
Federal Realty GP LLC
Nature Of Operations [Abstract]
Limited Liability Company ownership interest	100.00%
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Limited Liability Company ownership interest	100.00%