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Cover - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 19, 2020
Jun. 28, 2019
Cover page.      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-32269    
Entity Registrant Name EXTRA SPACE STORAGE INC.    
Entity Central Index Key 0001289490    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 20-1076777    
Entity Address, Address Line One 2795 East Cottonwood Parkway, Suite 300    
Entity Address, City or Town Salt Lake City    
Entity Address, State or Province UT    
Entity Address, Postal Zip Code 84121    
City Area Code 801    
Local Phone Number 365-4600    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol EXR    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Smaller Reporting Company false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 13,214,610,280
Entity Common Stock, Shares Outstanding   129,613,332  
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement to be issued in connection with the registrant’s annual stockholders’ meeting to be held in 2020 are incorporated by reference into Part III of this Annual Report on Form 10-K.