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v3.20.2

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions |  |  | 2 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2020 | Feb. 14, 2020 | Mar. 31, 2020 | Sep. 30, 2020
Master Lease |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Decrease in annual rent payment |  | $ 133 |  |
Annual rent payments under master lease of properties | $ 828 | $ 813 | $ 813 |
Percentage of fixed annual rent | 2.00% |  |  |
Real Estate Assets and Leases [Member] | Blackstone Real Estate Income Trust [Member] | Bellagio [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage ownership interest |  |  |  | 5.00%
MGP [Member] | Blackstone Real Estate Income Trust [Member] | Lease Agreements [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage ownership interest |  |  |  | 50.10%

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- Definition Decrease in annual rent payment. + References No definition available. + Details
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Balance Type: | credit
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- Definition Percentage of fixed annual rent. + References No definition available. + Details
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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
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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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- 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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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
Name: | us-gaap_SubsegmentsAxis=mgm_BellagioMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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