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LONG-TERM DEBT - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Sep. 30, 2024
Debt Instrument [Line Items]
Long term debt	$ 6,260,327	$ 6,403,119
Less: Unamortized discounts and debt issuance costs, net	(30,186)	(41,021)
Long-term debt	$ 6,230,141	6,362,098
5.25% MGM China senior notes, due 2025
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	5.25%
Senior notes	$ 0	500,000
5.875% MGM China senior notes, due 2026
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	5.875%
Senior notes	$ 750,000	750,000
4.625% senior notes, due 2026
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	4.625%
Senior notes	$ 400,000	400,000
5.5% senior notes, due 2027
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	5.50%
Senior notes	$ 675,000	675,000
4.75% MGM China senior notes, due 2027
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	4.75%
Senior notes	$ 750,000	750,000
4.75% senior notes, due 2028
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	4.75%
Senior notes	$ 750,000	750,000
6.125% senior notes, due 2029
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	6.125%		6.125%
Senior notes	$ 850,000	850,000
7.125% MGM China senior notes, due 2031
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	7.125%
Senior notes	$ 500,000	500,000
6.5% senior notes, due 2032
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	6.50%
Senior notes	$ 750,000	750,000
7% debentures, due 2036
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	7.00%
Senior notes	$ 552	552
Revolving Credit Facility
Debt Instrument [Line Items]
Long term debt	1,350,000
Revolving Credit Facility \| Senior secured yen credit facility
Debt Instrument [Line Items]
Line of credit facility	346,528	0
Revolving Credit Facility \| M G M China Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility	488,247	0
Revolving Credit Facility \| MGM China first revolving credit facility
Debt Instrument [Line Items]
Long term debt	$ 0	$ 477,567