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Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Nov. 15, 2019
Blackstone Real Estate Income Trust
Loss Contingencies [Line Items]
Guarantee obligation amount	$ 3,010,000,000.00	$ 3,010,000,000.00
MGP BREIT Venture
Loss Contingencies [Line Items]
Guarantee obligation amount	$ 3,000,000,000
Guarantee term	12 years
Percentage of principal amount outstanding guaranteed	10.00%
MGM Grand Paradise SA | Extension Agreement
Loss Contingencies [Line Items]
Guarantee obligation amount	$ 102,000,000
MGP Senior Credit Facility
Loss Contingencies [Line Items]
Credit facility outstanding	0
Senior Credit Facility
Loss Contingencies [Line Items]
Credit facility outstanding	33,000,000
Letters of credit | MGP Senior Credit Facility
Loss Contingencies [Line Items]
Line of credit facility	75,000,000
Letters of credit | Senior Credit Facility
Loss Contingencies [Line Items]
Line of credit facility	$ 1,350,000,000

X

- Definition

Percentage of principal amount outstanding guaranteed.

+ References

No definition available.

+ Details

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Namespace Prefix:	mgm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

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X

- Definition

Describe the approximate term of the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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.

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