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Organization - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 04, 2021 USD ($) Renewal_period $ / shares shares | Jun. 30, 2021 USD ($) Renewal_period | Jun. 30, 2021 Property Segment | Sep. 30, 2021 | Dec. 31, 2020
Organization Disclosure [Line Items] |  |  |  |  |
Number of reportable segments | Segment |  |  | 3 |  |
CityCenter Holdings LLC As Investee [Member] |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Percentage ownership interest |  | 50.00% | 50.00% |  | 50.00%
CityCenter Holdings LLC As Investee [Member] | Scenario Forecast [Member] |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Percentage ownership interest |  |  |  | 100.00% |
BetMGM LLC [Member] |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Percentage ownership interest |  | 50.00% | 50.00% |  | 50.00%
Infinity World Development Corp [Member] | CityCenter Holdings LLC As Investee [Member] |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Cash consideration |  | $ 2,125 |  |  |
Percentage ownership interest |  | 50.00% | 50.00% |  |
Entain plc [Member] | BetMGM LLC [Member] |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Percentage ownership interest |  | 50.00% | 50.00% |  |
Bellagio BREIT Venture [Member] |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Percentage of minority interest |  | 5.00% | 5.00% |  |
MGP BREIT Venture [Member] |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Partnership interest |  |  | 50.10% |  |
Percentage of minority interest |  | 49.90% | 49.90% |  |
VICI Properties, Inc [Member] | Subsequent Event [Member] |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Shares newly issued | shares | 1.366 |  |  |  |
Operating partnership units received | shares | 1.366 |  |  |  |
Fixed exchange ratio, share price | $ / shares | $ 43 |  |  |  |
Cash consideration | $ 4,400 |  |  |  |
Ownership interest | $ 370 |  |  |  |
Lease agreement initial lease term | 25 years |  |  |  |
Number of renewal periods, exercisable at option | Renewal_period | 3 |  |  |  |
Lease agreement renewal period | 10 years |  |  |  |
Annual rent | $ 860 |  |  |  |
Annual rent escalating from year one through year ten | 2.00% |  |  |  |
Annual rent escalator after year ten | 2.00% |  |  |  |
Annual rent escalator cap after year ten | 3.00% |  |  |  |
Blackstone Real Estate Income Trust [Member] | Aria and Vdara [Member] |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Cash consideration |  | $ 3,890 |  |  |
Lease agreement initial lease term |  | 30 years | 30 years |  |
Number of renewal periods, exercisable at option | Renewal_period |  | 3 |  |  |
Lease agreement renewal period |  | 10 years | 10 years |  |
Annual rent |  | $ 215 |  |  |
Annual rent escalator from year one through year fifteen |  | 2.00% |  |  |
Annual rent escalator after year fifteen |  | 2.00% |  |  |
Annual rent escalator cap after year fifteen |  | 3.00% |  |  |
Lease rolling period |  | 5 years |  |  |
Lease succeeding period |  | 1 year |  |  |
Subsidiary of Blackstone Real Estate Income Trust [Member] | Bellagio BREIT Venture [Member] |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Percentage of ownership interest |  |  | 95.00% |  |
MGM China [Member] |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Percentage ownership interest |  |  | 56.00% |  |
Number of integrated casino | Property |  |  | 2 |  |
Non-Guarantor MGP Subsidiaries [Member] | Class A shares [Member] |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Common stock voting rights |  |  | one vote per share |  |
Non-Guarantor MGP Subsidiaries [Member] | Class B shares [Member] |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Common stock voting rights |  |  | Class B share, is entitled to an amount of votes representing a majority of the total voting power of MGP’s shares so long as the Company and its controlled affiliates’ (excluding MGP) aggregate beneficial ownership of the combined economic interests in MGP and the Operating Partnership does not fall below 30%. |  |
MGM Growth Properties LLC [Member] |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Minimum ownership percentage required for majority voting interest |  |  | 30.00% |  |
Partnership interest |  |  | 41.60% |  |
Percentage of minority interest |  | 58.40% | 58.40% |  |

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