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Cover
Apr. 11, 2023
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Apr. 11, 2023
Entity File Number 001-15319
Entity Registrant Name DIVERSIFIED HEALTHCARE TRUST
Entity Central Index Key 0001075415
Entity Tax Identification Number 04-3445278
Entity Incorporation, State or Country Code MD
Entity Address, Address Line One Two Newton Place
Entity Address, Address Line Two 255 Washington Street
Entity Address, Address Line Three Suite 300
Entity Address, City or Town Newton
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02458-1634
City Area Code 617
Local Phone Number 796-8350
Written Communications true
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document Information [Line Items]  
Title of 12(b) Security Common Shares of Beneficial Interest
Trading Symbol DHC
Security Exchange Name NASDAQ
Senior Notes Due 2042  
Document Information [Line Items]  
Title of 12(b) Security 5.625% Senior Notes due 2042
Trading Symbol DHCNI
Security Exchange Name NASDAQ
Senior Notes Due 2046  
Document Information [Line Items]  
Title of 12(b) Security 6.25% Senior Notes due 2046
Trading Symbol DHCNL
Security Exchange Name NASDAQ