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Description of the Business	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of the Business	Description of the Business Public Storage (referred to herein as “the Company,” “we,” “us,” or “our”), a Maryland real estate investment trust (“REIT”), was organized in 1980. Our principal business activities include the ownership and operation of self-storage facilities that offer storage spaces for lease, generally on a month-to-month basis, for personal and business use, ancillary activities such as tenant reinsurance to the tenants at our self-storage facilities, merchandise sales, and third party management, as well as the acquisition and development of additional self-storage space. At September 30, 2021, we have direct and indirect equity interests in 2,678 self-storage facilities (with approximately 186.4 million net rentable square feet) located in 39 states in the United States (“U.S.”) operating under the Public Storage® name, and 0.9 million net rentable square feet of commercial and retail space. We own an approximate 35% common equity interest in Shurgard Self Storage SA (“Shurgard”), a public company traded on Euronext Brussels under the “SHUR” symbol, which owns 247 self-storage facilities (with approximately 13 million net rentable square feet) located in seven Western European countries, all operating under the Shurgard® name. We also own an approximate 42% common equity interest in PS Business Parks, Inc. (“PSB”), a REIT traded on the New York Stock Exchange under the “PSB” symbol, which owns 28 million net rentable square feet of commercial properties, primarily multi-tenant industrial, flex, and office space, located in six states. Disclosures of the number and square footage of facilities, as well as the number and coverage of tenant reinsurance policies (Note 12) are unaudited and outside the scope of our independent registered public accounting firm’s review of our financial statements in accordance with the standards of the Public Company Accounting Oversight Board (U.S.).

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- Definition

The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-URI http://asc.fasb.org/topic&trid=2134479

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- References

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