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LONG-TERM DEBT - Additional Information (Details) € in Millions, kr in Millions |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
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Sep. 22, 2022 USD ($) | Oct. 31, 2024 USD ($) | May 31, 2024 USD ($) | May 31, 2024 HKD ($) | Feb. 29, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 HKD ($) | Oct. 31, 2023 USD ($) | Oct. 31, 2023 HKD ($) | Aug. 31, 2023 USD ($) | Aug. 31, 2023 HKD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2024 HKD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Apr. 30, 2024 USD ($) | Aug. 31, 2023 SEK (kr) | Sep. 22, 2022 EUR (€) | Sep. 22, 2022 SEK (kr)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,175,000,000 | $ 1,285,600,000 | $ 1,070,340,000 |  |  |  |  |  |  |
Long-term debt, fair value |  |  |  |  |  | $ 6,300,000,000 |  |  |  |  |  |  |  | $ 6,300,000,000 | $ 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% |  |  |  |  |  |
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, 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
7.75% senior notes, due 2022 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (in percent) |  |  |  |  |  |  |  |  |  |  |  |  | 7.75% |  |  |  |  |  |  |  |  |  |
Redemption of debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |
LeoVegas Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal amount | $ 65,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | kr 700
Debt Instrument, redemption price (in percent) | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount after optional increase | $ 74,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800
Debt instrument, repurchase amount | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | kr 319
Long-term debt, aggregate principal amount of debt purchased |  |  |  |  |  |  |  |  |  | $ 36,000,000 |  |  |  |  |  |  |  |  |  |  | kr 382 |  |
5.375% MGM China senior notes, due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.375% |  |  | 5.375% |  |  |  |  |  |
5.375% MGM China 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | LeoVegas Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 40 |
Line of credit facility, redemption period (in days) | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Minimum | HIBOR | MGM China first revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.625% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Maximum | HIBOR | MGM China first revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Senior Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  | $ 2,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility drawn |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Senior Credit Facility | Minimum | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (in percent) |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Senior Credit Facility | Maximum | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (in percent) |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | MGM China first revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000,000 |  |  |  |  |  |  |  |  |
Line of credit facility drawn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,750,000,000 |  |  |  |  |  |
Debt instrument, weighted average interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.55% |  |  | 7.55% |  |  |  |  |  |
Unsecured Revolving Credit Facility | M G M China Second Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 753,000,000 |  |  | $ 5,850,000,000 |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity, increase |  |  |  |  |  | $ 13,000,000 | $ 100,000,000 | $ 151,000,000 | $ 1,170,000,000 | $ 26,000,000 | $ 205,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Revolving Credit Facility | M G M China Second Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  | $ 5,850,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility drawn |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity, increase |  |  | $ 162,000,000 | $ 1,260,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Revolving Credit Facility | Minimum | HIBOR | MGM China Second Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.625% |  |  |  |  |  |  |  |  |
Unsecured Revolving Credit Facility | Maximum | HIBOR | MGM China Second Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |  |  |  |

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