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LONG-TERM DEBT - Additional Information (Details)
¥ in Billions, $ in Billions
 1 Months Ended 9 Months Ended
Oct. 29, 2025
JPY (¥)
Jun. 30, 2025
USD ($)
Oct. 31, 2024
USD ($)
May 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
HKD ($)
Dec. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
Apr. 30, 2024
USD ($)
Debt Instrument [Line Items]                    
Repayment of long-term debt         $ 500,000,000 $ 1,500,000,000        
Long-term debt, fair value         $ 6,200,000,000     $ 6,300,000,000    
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        
Long-term debt, interest rate (in percent)           6.125%        
Senior Notes 5.75% Due 2025 | Senior Notes                    
Debt Instrument [Line Items]                    
Long-term debt, interest rate (in percent)     5.75%              
Repayment of long-term debt     $ 675,000,000              
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%     6.50%
6.5% senior notes, due 2032 | Senior Notes                    
Debt Instrument [Line Items]                    
Long-term debt, principal amount                   $ 750,000,000
6.75% senior notes, due 2025 | Senior Notes                    
Debt Instrument [Line Items]                    
Long-term debt, interest rate (in percent)       6.75%            
Repayment of long-term debt       $ 750,000,000            
5.25% MGM China senior notes, due 2025                    
Debt Instrument [Line Items]                    
Long-term debt, interest rate (in percent)         5.25%   5.25%      
5.25% MGM China senior notes, due 2025 | Senior Notes                    
Debt Instrument [Line Items]                    
Long-term debt, interest rate (in percent)   5.25%                
Repayment of long-term debt   $ 500,000,000                
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, principal amount                 $ 500,000,000  
Long-term debt, interest rate (in percent)                 7.125%  
5.375% MGM China senior notes, due 2024 | Senior Notes                    
Debt Instrument [Line Items]                    
Long-term debt, interest rate (in percent)       5.375%            
Repayment of long-term debt       $ 750,000,000            
Revolving Credit Facility | 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          
Revolving Credit Facility | Senior Secured Yen Credit Facility | Line of Credit | Subsequent Event                    
Debt Instrument [Line Items]                    
Line of credit facility | ¥ ¥ 45.2                  
Option for higher credit facility amount | ¥ ¥ 67.8                  
Revolving Credit Facility | Senior Secured Yen Credit Facility | Line of Credit | Subsequent Event | Interest Rate Scenario One                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate (as a percent) 1.75%                  
Revolving Credit Facility | Senior Secured Yen Credit Facility | Line of Credit | Subsequent Event | Minimum | Interest Rate Scenario Two                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate (as a percent) 1.50%                  
Revolving Credit Facility | Senior Secured Yen Credit Facility | Line of Credit | Subsequent Event | Maximum | Interest Rate Scenario Two                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate (as a percent) 2.25%                  
Revolving Credit Facility | MGM China revolving credit facility | Line of Credit                    
Debt Instrument [Line Items]                    
Line of credit facility         $ 3,000,000,000   $ 23.4      
Debt instrument, weighted average interest rate (in percent)         6.18%   6.18%      
Revolving Credit Facility | MGM China revolving credit facility | Line of Credit | Minimum                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate (as a percent)         1.625%          
Revolving Credit Facility | MGM China revolving credit facility | Line of Credit | Maximum                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate (as a percent)         2.75%