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Organization - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 28, 2021 USD ($) | Sep. 27, 2021 USD ($) renewal_period | Aug. 04, 2021 USD ($) renewal_period $ / shares shares | Sep. 30, 2021 USD ($) segment property vote renewal_period | Dec. 31, 2020
Organization Disclosure [Line Items] |  |  |  |  |
Number of reportable segments | segment |  |  |  | 3 |
City Center Holdings L L C |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Ownership interest acquired |  | 50.00% |  |  |
Cosmopolitan of Las Vegas |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Cash consideration |  | $ 1,625 |  |  |
BetMGM |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Percentage ownership interest |  |  |  | 50.00% | 50.00%
Entain plc | BetMGM |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Percentage ownership interest |  |  |  | 50.00% |
Bellagio BREIT Venture |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Percentage of minority interest |  |  |  | 5.00% |
MGP BREIT Venture |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Partnership interest |  |  |  | 50.10% |
Percentage of minority interest |  |  |  | 49.90% |
VICI Properties, Inc |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Shares newly issued ( in shares) | shares |  |  | 1.366 |  |
Operating partnership units received (in shares) | shares |  |  | 1.366 |  |
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% |  |
VICI Properties, Inc | MGP |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Fixed exchange ratio (in dollars per share) | $ / shares |  |  | $ 43 |  |
Cosmopolitan of Las Vegas |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Lease agreement initial lease term |  | 30 years |  |  |
Number of renewal periods, exercisable at option | renewal_period |  | 3 |  |  |
Lease agreement renewal period |  | 10 years |  |  |
Annual rent |  | $ 200 |  |  |
Annual rent escalating from year one through year ten |  | 2.00% |  |  |
Annual rent escalator cap after year ten |  | 3.00% |  |  |
Affiliated Entity | Aria and Vdara |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Lease agreement initial lease term |  |  |  | 30 years |
Number of renewal periods, exercisable at option | renewal_period |  |  |  | 3 |
Lease agreement renewal period |  |  |  | 10 years |
Annual rent |  |  |  | $ 215 |
Affiliated Entity | Aria and Vdara | City Center Holdings L L C |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Cash consideration for sale of assets | $ 3,890 |  |  |  |
Subsidiary of Blackstone Real Estate Income Trust | Bellagio BREIT Venture |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Percentage of ownership interest |  |  |  | 95.00% |
MGM China |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Percentage ownership interest |  |  |  | 56.00% |
Number of integrated casino | property |  |  |  | 2 |
Non-Guarantor MGP Subsidiaries | Class A shares |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Common stock, number of votes per share | vote |  |  |  | 1 |
MGM Growth Properties LLC |  |  |  |  |
Organization Disclosure [Line Items] |  |  |  |  |
Minimum ownership percentage required for majority voting interest |  |  |  | 30.00% |
Partnership interest |  |  |  | 41.60% |
Percentage of minority interest |  |  |  | 58.40% |

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