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ORGANIZATION (Details) $ in Millions | 6 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2026 USD ($) | Sep. 30, 2025 segment resort | May 01, 2026
Organization Disclosure [Line Items] |  |  |
Number of reportable segments | segment |  | 4 |
Subsequent Event | Forecast |  |  |
Organization Disclosure [Line Items] |  |  |
Rent escalator percentage |  |  | 2.00%
Subsequent Event | MGM Northfield Park | Forecast |  |  |
Organization Disclosure [Line Items] |  |  |
Cash consideration | $ 546 |  |
Decrease in annual rent payment under master lease | $ 53 |  |
BetMGM North America Venture |  |  |
Organization Disclosure [Line Items] |  |  |
Ownership interest (as a percent) |  | 50.00% |
BetMGM North America Venture | Entain plc |  |  |
Organization Disclosure [Line Items] |  |  |
Ownership interest (as a percent) |  | 50.00% |
MGM Osaka | Japan |  |  |
Organization Disclosure [Line Items] |  |  |
Ownership interest (as a percent) |  | 50.00% |
MGM China |  |  |
Organization Disclosure [Line Items] |  |  |
Controlling interest (as a percent) |  | 56.00% |
Number of integrated casino | resort |  | 2 |

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