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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of ownership interest | 100.00% |  |  |
Total assets | $ 33,876,356,000 | $ 30,210,706,000 |  |
Total liabilities | 21,108,391,000 | 19,638,665,000 |  |
Investments in and advances to unconsolidated affiliates | 822,366,000 | 732,867,000 |  |
Accrual for property and equipment | 14,000,000 | 47,000,000 |  |
Impairment charges | 0 | 0 | $ 0 |
Commissions, complimentaries and other incentives | 2,500,000,000 | 2,300,000,000 | 2,100,000,000 |
Advertising expense | 257,000,000 | 305,000,000 | 223,000,000 |
Operating lease right-of-use assets, net | 4,392,481,000 | 0 |  | $ 656,000,000
Operating lease liabilities | 4,345,443,000 |  |  | $ 580,000,000
Food and Beverage Revenue [Member] |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Lease revenue | 53,000,000 | 51,000,000 | 51,000,000 |
Entertainment Retail and Other Revenue [Member] |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Lease revenue | $ 89,000,000 | $ 87,000,000 | $ 79,000,000 |
Accounts Receivable [Member] | Customer Concentration [Member] |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of gross casino accounts receivable | 57.00% | 62.00% |  |
Bellagio Blackstone Real Estate Income Trust [Member] |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of equity interest in joint venture | 5.00% |  |  |
Investments in and advances to unconsolidated affiliates | $ 61,000,000 |  |  |
MGM Growth Properties LLC [Member] |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Total assets | 11,900,000,000 |  |  |
Total liabilities | $ 5,000,000,000.0 |  |  |

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