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LONG-TERM DEBT - Additional Information (Details) $ in Millions | 1 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 30, 2024 USD ($) | May 31, 2024 USD ($) | May 31, 2024 HKD ($) | Aug. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 HKD ($) | Jun. 30, 2024 USD ($) | Apr. 30, 2024 USD ($) | Feb. 29, 2024 USD ($) | Dec. 31, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption of debt |  |  |  |  |  | $ 1,500,000,000 | $ 1,285,600,000 |  |  |  |  |
Long-term debt, fair value |  |  |  |  |  | $ 6,900,000,000 |  |  |  |  |  | $ 6,300,000,000
5.25% MGM China senior notes, due 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (in percent) |  |  |  |  |  | 5.25% |  | 5.25% |  |  |  |
Senior secured credit facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  |  |  |  |  |  |  | $ 2,300,000,000 |
Line of credit facility drawn |  |  |  |  |  | $ 0 |  |  |  |  |  |
MGM China first revolving credit facility | Line of Credit | Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  |  | $ 1,300,000,000 |  | $ 9,750 |  |  |  |
Debt instrument, weighted average interest rate (in percent) |  |  |  |  |  | 6.82% |  | 6.82% |  |  |  |
MGM China second revolving credit facility | Line of Credit | Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  | $ 5,850 |  |  | $ 753,000,000 |  | $ 5,850 |  |  |  |
Line of credit facility drawn |  |  |  |  |  | $ 0 |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity, increase |  | $ 161,000,000 | $ 1,260 |  |  |  |  |  |  |  |  |
6.125% senior notes, due 2029 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (in percent) |  |  |  |  |  | 6.125% |  | 6.125% |  |  |  |
6.125% senior notes, due 2029 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (in percent) |  |  |  |  |  | 6.125% |  | 6.125% |  |  |  |
Long-term debt, principal amount |  |  |  |  |  | $ 850,000,000 |  |  |  |  |  |
5.75% senior notes, due 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (in percent) |  |  |  |  |  | 5.75% |  | 5.75% |  |  |  |
5.75% senior notes, due 2025 | Senior Notes | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (in percent) | 5.75% |  |  |  |  |  |  |  |  |  |  |
Redemption of debt | $ 675,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, redemption price (in percent) | 100.607% |  |  |  |  |  |  |  |  |  |  |
6.5% senior notes, due 2032 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (in percent) |  |  |  |  |  | 6.50% |  | 6.50% |  |  |  |
6.5% senior notes, due 2032 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (in percent) |  |  |  |  |  |  |  |  |  | 6.50% |  |
Long-term debt, principal amount |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |
6.75% senior notes, due 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (in percent) |  |  |  |  |  | 6.75% |  | 6.75% |  |  |  |
6.75% senior notes, due 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (in percent) |  |  | 6.75% |  |  |  |  |  |  |  |  |
Redemption of debt |  | 750,000,000 |  |  |  |  |  |  |  |  |  |
6% Senior Notes, Due 2023 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (in percent) |  |  |  |  | 6.00% |  |  |  |  |  |  |
Redemption of debt |  |  |  |  | $ 1,250,000,000 |  |  |  |  |  |  |
7.125% MGM China senior notes, due 2031 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (in percent) |  |  |  |  |  | 7.125% |  | 7.125% |  |  |  |
7.125% MGM China senior notes, due 2031 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (in percent) |  |  |  |  |  |  |  |  | 7.125% |  |  |
Long-term debt, principal amount |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |
5.375% Senior Notes, Due 2024 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (in percent) |  |  | 5.375% |  |  |  |  |  |  |  |  |
Redemption of debt |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |
Leo Vegas Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption of debt |  |  |  | $ 36,000,000 |  |  |  |  |  |  |  |

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