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RELATED PARTY TRANSACTIONS - Additional Information (Detail) - USD ($) $ in Millions	Apr. 01, 2022	Mar. 31, 2022	Mar. 31, 2023
Bellagio BREIT Venture
Related Party Transaction [Line Items]
Percentage of minority interest			5.00%
Master Lease
Related Party Transaction [Line Items]
Annual rent payments	$ 877	$ 873
Fixed annual rent escalator percentage	2.00%
Increase in annual rent payments	$ 16
Decrease in annual rent payments	$ 12
Term to reset rent payments	5 years

X

- Definition

Decrease In Annual Rent Payment

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Fixed annual rent escalator percentage.

+ References

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+ Details

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X

- Definition

Increase In Annual Rent Payment

+ References

No definition available.

+ Details

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X

- Definition

Minority interest ownership percentage in unconsolidated affiliate.

+ References

No definition available.

+ Details

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Namespace Prefix:	mgm_
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X

- Definition

Rent Payment, Rent Reset Period

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977

+ Details

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Balance Type:	debit
Period Type:	duration

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.

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- Details

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Balance Type:
Period Type:

X

- Details

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