XML 18 R1.htm IDEA: XBRL DOCUMENT v3.22.0.1
Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 08, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 1-13881    
Entity Registrant Name MARRIOTT INTERNATIONAL INC /MD/    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 52-2055918    
Entity Address, Address Line One 10400 Fernwood Road    
Entity Address, City or Town Bethesda    
Entity Address, State or Province MD    
Entity Address, Postal Zip Code 20817    
City Area Code 301    
Local Phone Number 380-3000    
Title of 12(b) Security Class A Common Stock, $0.01 par value    
Trading Symbol MAR    
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 Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 37,430,276,528
Entity Common Stock, Shares Outstanding   326,311,111  
Documents Incorporated by Reference Portions of the Proxy Statement prepared for the 2022 Annual Meeting of Stockholders are incorporated by reference into Part III of this report.    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001048286    
Current Fiscal Year End Date --12-31