Debt Instrument, Face Amount After Optional Increase

No definition available.

Name:	mgm_DebtInstrumentFaceAmountAfterOptionalIncrease
Namespace Prefix:	mgm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt instrument issued price percentage.

+ References

No definition available.

+ Details

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

- Definition

Debt Instrument, Redemption Period

+ References

No definition available.

+ Details

Name:	mgm_DebtInstrumentRedemptionPeriod
Namespace Prefix:	mgm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Name Accounting Standards Codification
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+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
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+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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-Paragraph 1
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+ Details

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

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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

+ Details

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

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

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-Publisher FASB
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+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Namespace Prefix:
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- Details

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- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_LeoVegasSeniorNotesMember
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Period Type:

- Details

Name:	us-gaap_VariableRateAxis=mgm_StockholmInterbankOfferedRateSTIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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- Details

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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- Details

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LONG-TERM DEBT - Additional Information (Detail) € in Millions, kr in Millions, $ in Millions	1 Months Ended		9 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2022 HKD ($)	Sep. 30, 2022 EUR (€)	Sep. 30, 2022 SEK (kr)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Long-term debt, fair value			$ 7,800,000,000				$ 13,400,000,000
7.75% senior notes, due 2022
Debt Instrument [Line Items]
Redemption of debt	$ 1,000,000,000
Long-term debt, interest rate (in percent)	7.75%		7.75%	7.75%	7.75%	7.75%
4.75% MGM China senior notes, due 2027
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)		4.75%	4.75%	4.75%	4.75%	4.75%
Long-term debt, principal amount		$ 750,000,000
Long term debt, issued price (in percent)		99.97%
LeoVegas Senior Notes
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)			6.98%	6.98%	6.98%	6.98%
Long-term debt, principal amount \| kr						kr 700
Face amount after optional increase \| kr						kr 800
Debt Instrument, redemption price (in percent)			101.00%
Debt Instrument, redemption period			60 days
LeoVegas Senior Notes \| Stockholm Interbank Offered Rate (STIBOR)
Debt Instrument [Line Items]
Percentage points added to the reference rate to compute the variable rate on the debt instrument			5.50%
Revolving Credit Facility \| LeoVegas Credit Facility
Debt Instrument [Line Items]
Line of credit facility \| €					€ 40
Line of credit facility, interest rate (in percent)			3.67%	3.67%	3.67%	3.67%
Revolving Credit Facility \| LeoVegas Credit Facility \| Eurodollar
Debt Instrument [Line Items]
Percentage points added to the reference rate to compute the variable rate on the debt instrument			2.50%
Revolving Credit Facility \| Senior Credit Facility
Debt Instrument [Line Items]
Line of credit facility			$ 1,675,000,000
Line of credit facility drawn			$ 0
Term Loan \| M G M China Credit Facility
Debt Instrument [Line Items]
Line of credit facility drawn				$ 9,750
Debt instrument, weighted average interest rate (in percent)			5.23%	5.23%	5.23%	5.23%
Unsecured Revolving Credit Facility \| MGM China Second Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility				$ 3,120
Line of credit facility drawn			$ 13,000,000
Debt instrument, weighted average interest rate (in percent)			4.81%	4.81%	4.81%	4.81%
Line of credit facility, current borrowing capacity				$ 3,900