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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Total assets $ 36,494,934,000 $ 33,876,356,000  
Investments in and advances to unconsolidated affiliates $ 1,447,043,000 822,366,000  
Percentage of ownership interest 100.00%    
Impairment charges $ 0 0 $ 0
Commissions, complimentaries and other incentives 1,100,000,000 2,500,000,000 2,300,000,000
Advertising expense $ 88,000,000 195,000,000 226,000,000
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true    
Change in Accounting Principle, Accounting Standards Update, Adoption Date Jan. 01, 2020    
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] true    
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member    
Food and Beverage Revenue [Member]      
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Lease revenue $ 24,000,000 53,000,000 51,000,000
Entertainment Retail and Other Revenue [Member]      
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Lease revenue $ 60,000,000 $ 89,000,000 $ 87,000,000
Accounts Receivable [Member] | Customer Concentration [Member]      
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Percentage of gross casino accounts receivable 52.00% 57.00%  
Bellagio Blackstone Real Estate Income Trust [Member]      
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Percentage of ownership interest 5.00%    
Investments in and advances to unconsolidated affiliates $ 60,000,000    
MGM Growth Properties LLC [Member]      
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]      
Total assets 10,600,000,000    
Total liabilities $ 5,000,000,000.0