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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%

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

X

- 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

X

- 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

X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=mgm_MasterLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_OwnershipAxis=mgm_RealEstateAssetsAndLeasesMember
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:

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_LeaseAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: