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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 15, 2019 | May 31, 2019
Loss Contingencies [Line Items] |  |  |  |  |
Settlement amount | $ 800,000,000 |  |  |  |
Insurance receivable | 751,000,000 |  |  |  |
Expense | 49,000,000 | $ 0 | $ 0 |  |
Blackstone Real Estate Income Trust [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Guarantee obligation amount | $ 3,010,000,000.00 |  |  | $ 3,010,000,000.00 |
Guarantee term | Bellagio BREIT Venture shortfall guarantee. The Company provides a shortfall guarantee of the $3.01 billion principal amount of indebtedness (and any interest accrued and unpaid thereon) of Bellagio BREIT Venture, which matures in 2029. The terms of the shortfall guarantee provide that after the lenders have exhausted certain remedies to collect on the obligations under the indebtedness, the Company would then be responsible for any shortfall between the value of the collateral, which is the real estate assets of Bellagio owned by Bellagio BREIT Venture, and the debt obligation. This guarantee is accounted for under ASC 460 at fair value; such value is immaterial. |  |  |  |
MGP BREIT Venture [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Guarantee obligation amount | $ 3,000,000,000.0 |  |  |  |
Guarantee term | MGP BREIT Venture shortfall guarantee. The Company provides a shortfall guarantee of the $3.0 billion principal amount of indebtedness (and any interest accrued and unpaid thereon) of MGP BREIT Venture, which has an initial term of twelve years, maturing in 2032, with an anticipated repayment date of March 2030. The terms of the shortfall guarantee provide that after the lenders have exhausted certain remedies to collect on the obligations under the indebtedness, the Company would then be responsible for any shortfall between the value of the collateral, which is the real estate assets of Mandalay Bay and MGM Grand Las Vegas, owned by MGP BREIT Venture, and the debt obligation. This guarantee is accounted for under ASC 460 at fair value; such value is immaterial. MGP BREIT Venture bad acts guarantee. The Operating Partnership provides a guarantee for the losses incurred by the lenders of the indebtedness of the MGP BREIT Venture arising out of certain bad acts by the Operating Partnership, its venture partner, or the venture, such as fraud or willful misconduct, based on the party’s percentage ownership of the MGP BREIT Venture. This guarantee is capped at 10% of the principal amount outstanding at the time of the loss. The Operating Partnership and its venture partner have separately indemnified each other for the other party’s share of the overall liability exposure, if at fault. The guarantee is accounted for under ASC 460 at fair value; such value is immaterial. |  |  |  |
Percentage of principal amount outstanding guaranteed | 10.00% |  |  |  |
MGM Grand Paradise SA [Member] | Extension Agreement [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Guarantee obligation amount |  |  |  |  | $ 103,000,000
Guarantee term | MGM China bank guarantee. In connection with the extension of the expiration of the gaming subconcession to June 2022, MGM Grand Paradise provided a bank guarantee in an amount of approximately $103 million (when giving effect to foreign currency exchange rate fluctuations) to the government of Macau in May 2019 to warrant the fulfillment of an existing commitment of labor liabilities upon the expiration of the gaming subconcession in June 2022. |  |  |  |
MGP Senior Credit Facility [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Credit facility outstanding | $ 0 |  |  |  |
Senior Credit Facility [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Credit facility outstanding | 26,000,000 |  |  |  |
Letters of credit [Member] | MGP Senior Credit Facility [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Line of credit facility | 75,000,000 |  |  |  |
Letters of credit [Member] | Senior Credit Facility [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Line of credit facility | 850,000,000 |  |  |  |
Corporate Expense [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Expense | $ 49,000,000 |  |  |  |

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