| Cover | Feb. 09, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 9, 2022 |
| Entity Registrant Name | MGM Resorts International |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-10362 |
| Entity Tax Identification Number | 88-0215232 |
| Entity Address, Address Line One | 3600 Las Vegas Boulevard South |
| Entity Address, City or Town | Las Vegas |
| Entity Address, State or Province | NV |
| Entity Address, Postal Zip Code | 89109 |
| City Area Code | 702 |
| Local Phone Number | 693-7120 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock (Par Value $0.01) |
| Trading Symbol | MGM |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000789570 |
| Amendment Flag | false |
