Description Of The Business (Narrative) (Details) ft² in Millions	6 Months Ended
	Jun. 30, 2020 ft² item state country shares	Dec. 31, 2019 shares
Public Storage [Member]
Nature Of Business [Line Items]
PSA self-storage facilities | item	2,500
Net rentable square feet	171.0
Number of states with facilities | state	38
Public Storage [Member] | Commercial and Retail Space [Member]
Nature Of Business [Line Items]
Net rentable square feet	0.9
Shurgard [Member]
Nature Of Business [Line Items]
Net rentable square feet	13.0
Shares owned | shares	31,268,459	31,268,459
Ownership interest, percentage	35.00%
Number of facilities owned by Shurgard | item	238
Number of countries in which entity operates | country	7
PSB [Member]
Nature Of Business [Line Items]
Net rentable square feet	27.5
Number of states with facilities | state	6
Ownership interest, percentage	42.00%