| Document and Entity Information | Mar. 13, 2023 |
| Cover [Abstract] | |
| Entity Registrant Name | MARRIOTT INTERNATIONAL INC /MD/ |
| Amendment Flag | true |
| Entity Central Index Key | 0001048286 |
| Document Type | 8-K/A |
| Document Period End Date | Mar. 13, 2023 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 1-13881 |
| Entity Tax Identification Number | 52-2055918 |
| Entity Address, Address Line One | 7750 Wisconsin Avenue |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock, $0.01 par value |
| Trading Symbol | MAR |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Description | This Form 8-K/A amends the Form 8-K that was filed by Marriott International, Inc. (the “Company”) on March 15, 2023 to report the election of Lauren R. Hobart and Grant F. Reid to the Company’s Board of Directors (the “Board”). |
