Cover Page - shares	9 Months Ended
	Sep. 30, 2022	Oct. 27, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
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, City or Town	Bethesda
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	20814
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		316,539,613
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001048286
Current Fiscal Year End Date	--12-31
Entity Address, Address Line One	7750 Wisconsin Avenue