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Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2019
Feb. 27, 2020
Jun. 28, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 1-11527    
Entity Registrant Name SERVICE PROPERTIES TRUST    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 04-3262075    
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 964-8389    
Title of 12(b) Security Common Shares of Beneficial Interest    
Trading Symbol SVC    
Security Exchange Name NASDAQ    
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 Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Public Float     $ 4.1
Entity Common Stock, Shares Outstanding   164,561,654  
Documents Incorporated by Reference
Certain information required by Items 10, 11, 12, 13 and 14 of Part III of this Annual Report on Form 10-K is incorporated by reference to our definitive Proxy Statement for the 2020 Annual Meeting of Shareholders to be filed with the Securities and Exchange Commission within 120 days after the fiscal year ended December 31, 2019.
    
Entity Central Index Key 0000945394    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY