Description Of The Business (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019 ft² state country item shares	Dec. 31, 2018 shares	Oct. 15, 2018	Dec. 31, 2017 shares
Nature Of Business [Line Items]
Net rentable square feet	168,908
Public Storage [Member]
Nature Of Business [Line Items]
PSA self-storage facilities | item	2,483
Net rentable square feet	169,000,000
Number of states with facilities | state	38
Public Storage [Member] | Commercial and Retail Space [Member]
Nature Of Business [Line Items]
Net rentable square feet	900,000
Shurgard [Member]
Nature Of Business [Line Items]
Net rentable square feet	13,000,000
Shares owned | shares	31,268,459	31,268,459		31,268,459
Ownership interest, percentage	35.00%		35.00%
Number of facilities owned by Shurgard | item	234
Number of countries in which entity operates | country	7
PSB [Member]
Nature Of Business [Line Items]
Net rentable square feet	27,600,000
Number of states with facilities | state	6
Ownership interest, percentage	42.00%