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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Ownership interest (in percent)     100.00%    
Fair value of investment $ 415   $ 415   $ 388
Net gain (loss) on equity investments (6) $ 48 27 $ (2)  
Loss reserve for accounts receivable 142   142   135
Accrual for property and equipment within accounts payable 82   82   109
Write-downs and impairment 93        
Empire City Gaming License | Empire City Reporting Unit          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Impairment of intangible assets 52        
Food and Beverage Revenue          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Lease revenue 18 21 54 62  
Entertainment Retail and Other Revenue          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Lease revenue 30 28 88 86  
MGM Grand Paradise SA | June 2022 Sub Concession Extension Contract          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Obligation amount 87   87   87
Foreign Exchange Forward          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Derivative asset 1   1    
Derivative liability 39   39   96
Derivative liability current         57
Derivative liability noncurrent         $ 39
Net gain (loss) on derivative $ (41) $ 87 $ 34 $ (13)  
Bellagio REIT Venture          
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]          
Ownership interest by noncontrolling owner (in percent) 5.00%   5.00%