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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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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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