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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 |  |

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