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v3.20.1

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions |  |  | 2 Months Ended
--- | --- | --- | ---
Apr. 01, 2020 | Feb. 14, 2020 | Mar. 31, 2020
Master Lease |  |  |
Related Party Transaction [Line Items] |  |  |
Decrease in annual rent payment |  | $ 133 |
Annual rent payments under master lease of properties |  | $ 813 | $ 813
Subsequent Event [Member] | Master Lease |  |  |
Related Party Transaction [Line Items] |  |  |
Annual rent payments under master lease of properties | $ 828 |  |
Percentage of fixed annual rent | 2.00% |  |
Real Estate Assets and Leased Back [Member] | Blackstone Real Estate Income Trust [Member] | Bellagio [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Ownership interest |  |  | 5.00%
MGP [Member] | Blackstone Real Estate Income Trust [Member] | Lease Agreements [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Ownership interest |  | 50.10% |

X
- Definition Decrease in annual rent payment. + References No definition available. + Details
Name: | mgm_DecreaseInAnnualRentPayment
Namespace Prefix: | mgm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Percentage of fixed annual rent. + References No definition available. + Details
Name: | mgm_PercentageOfFixedAnnualRent
Namespace Prefix: | mgm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LeaseArrangementTypeAxis=mgm_MasterLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_OwnershipAxis=mgm_RealEstateAssetsAndLeasedBackMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=mgm_BlackstoneRealEstateIncomeTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsegmentsAxis=mgm_BellagioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_OwnershipAxis=mgm_MGPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |