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ORGANIZATION - Additional Information (Details) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 property segment | Apr. 30, 2023 | Dec. 31, 2022
Organization Disclosure [Line Items] |  |  |
Number of reportable segments | segment | 3 |  |
BetMGM LLC |  |  |
Organization Disclosure [Line Items] |  |  |
Ownership interest (in percent) | 50.00% |  | 50.00%
BetMGM LLC | Entain plc |  |  |
Organization Disclosure [Line Items] |  |  |
Ownership interest (in percent) | 50.00% |  |
Japanese Joint Venture | JAPAN |  |  |
Organization Disclosure [Line Items] |  |  |
Ownership interest (in percent) |  | 50.00% |
MGM China |  |  |
Organization Disclosure [Line Items] |  |  |
Controlling interest (in percent) | 56.00% |  |
Number of integrated casino | property | 2 |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 + Details
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