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INCOME TAXES - Schedule of Income Tax Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax valuation allowance:
Balance at Beginning of Period	$ 2,884,262	$ 2,875,595	$ 2,574,056
Increase	2,313	8,667	301,539
Decrease	0	0	0
Balance at End of Period	$ 2,886,575	$ 2,884,262	$ 2,875,595

X

- Definition

Valuation Allowance, Deferred Tax Asset, Decrease, Amount

+ References

No definition available.

+ Details

Name:	mgm_ValuationAllowanceDeferredTaxAssetDecreaseAmount
Namespace Prefix:	mgm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Valuation Allowance, Deferred Tax Asset, Increase, Amount

+ References

No definition available.

+ Details

Name:	mgm_ValuationAllowanceDeferredTaxAssetIncreaseAmount
Namespace Prefix:	mgm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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