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Description of the Business (Narrative) (Details) ft² in Millions	9 Months Ended
	Sep. 30, 2021 ft² storageFacility state country	Dec. 31, 2020
Shurgard
Nature Of Business [Line Items]
Net rentable area (in square feet)	13.0
Ownership interest (percentage)	35.00%	35.00%
Number of facilities owned by Shurgard | storageFacility	247
Number of countries in which entity operates | country	7
PSB
Nature Of Business [Line Items]
Net rentable area (in square feet)	28.0
Number of states with facilities | state	6
Ownership interest (percentage)	42.00%	42.00%
Public Storage
Nature Of Business [Line Items]
PSA number of self-storage facilities | storageFacility	2,678
Net rentable area (in square feet)	186.4
Number of states with facilities | state	39
Public Storage | Commercial and Retail Space
Nature Of Business [Line Items]
Net rentable area (in square feet)	0.9

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- Definition

Number of self-storage facilities direct and indirect interest.

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Nature Of Business [Line Items]

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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- Definition

Net rentable area for properties owned.

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- Definition

The number of countries in which the entity operates as of balance sheet date.

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- Definition

The number of real estate properties owned as of the balance sheet date.

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- Definition

The number of states the entity operates in as of the balance sheet date.

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