Debt instrument amortization periodic payments.

No definition available.

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

- Definition

Debt instrument maturity.

+ References

No definition available.

+ Details

Name:	mgm_DebtInstrumentMaturity
Namespace Prefix:	mgm_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument maturity year.

+ References

No definition available.

+ Details

Name:	mgm_DebtInstrumentMaturityYear
Namespace Prefix:	mgm_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument repurchase expiration date.

+ References

No definition available.

+ Details

Name:	mgm_DebtInstrumentRepurchaseExpirationDate
Namespace Prefix:	mgm_
Data Type:	xbrli:dateItemType
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:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 3: 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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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:	num: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

Date the debt instrument was repurchased, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchaseDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

+ Details

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

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

Name:	us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

+ Details

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

- 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

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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ Details

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

- Definition

Maximum amount borrowed under the credit facility at any time during the period.

+ References

No definition available.

+ Details

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

- 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

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

Name:	us-gaap_LongTermDebtCurrent
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

+ Details

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

- Definition

The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

+ References

+ Details

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_SeniorSecuredTermLoanAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=mgm_OperatingPartnershipSeniorCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_SeniorSecuredTermLoanBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_TermLoanBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_OperatingPartnershipSeniorNotesFivePointSevenFivePercentDueInTwoThousandTwentySevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mgm_EmpireCityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=mgm_BridgeFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_SeniorNotesFivePointTwoFivePercentDueInTwoThousandTwentyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_SeniorNotesSixPointSevenFivePercentDueTwoThousandTwentyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_SeniorNotesSixPointSixTwoFivePercentDueTwoThousandTwentyOneNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_SeniorNotesFivePointFivePercentDueTwoThousandTwentySevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_SeniorNotesEightPointSixTwoFivePercentDueInTwoThousandNineteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_SeniorNotesFivePointSevenFivePercentDueInTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_SeniorNotesFivePointSevenFiveZeroPercentDueTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_SeniorNotesFourPointSixTwoFivePercentDueTwoThousandTwentySixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_SeniorNotesFivePointFiveZeroZeroPercentDueTwoThousandTwentySevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_MGMChinaSeniorNotesFivePointThreeSevenFivePercentDueInTwoThousandTwentyFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mgm_MGMChinaSeniorNotesFivePointEightSevenFivePercentDueInTwoThousandTwentySixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=mgm_SeniorCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mgm_MGPBREITVentureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OtherNonoperatingIncomeExpenseMember
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

Name:	us-gaap_LongtermDebtTypeAxis=mgm_MGMChinaCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

Long-Term Debt - Additional Information (Detail) - USD ($)		1 Months Ended								3 Months Ended	12 Months Ended
	Feb. 18, 2020	Dec. 31, 2019	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Apr. 30, 2019	Feb. 28, 2019	Jan. 31, 2019	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Current portion of long-term debt, net of debt issuance costs		$ 0								$ 0	$ 0	$ 43,411,000
Credit facility amount		11,271,706,000								11,271,706,000	11,271,706,000	15,253,239,000
Loss on early retirement of debt		171,000,000								142,000,000	198,151,000	3,619,000	$ 45,696,000
Repayments of senior notes											3,764,167,000	2,265,000	$ 502,669,000
Long-term debt, fair value		12,100,000,000								12,100,000,000	$ 12,100,000,000	$ 15,100,000,000
Subsequent Event [Member]
Debt Instrument [Line Items]
Debt instrument repurchase date	Mar. 02, 2020
Debt instrument repurchase expiration date	Mar. 16, 2020
Term Loan A [Member] \| Operating Partnership Senior Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, maturity year											2023
Repayments of term loan			$ 65,000,000
Credit facility amount		$ 399,000,000								$ 399,000,000	$ 399,000,000
Term loan amortization of principal quarterly installment											$ 3,000,000
Debt instrument, interest rate		3.55%								3.55%	3.55%
Term Loan A [Member] \| Minimum [Member] \| LIBOR [Member] \| Operating Partnership Senior Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)											1.75%
Term Loan A [Member] \| Maximum [Member] \| LIBOR [Member] \| Operating Partnership Senior Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)											2.25%
Term Loan B [Member] \| Operating Partnership Senior Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)											2.00%
Repayments of term loan			476,000,000
Credit facility, maturity date											2025-03
Credit facility amount		$ 1,300,000,000								$ 1,300,000,000	$ 1,300,000,000
Term loan amortization of principal quarterly installment											$ 5,000,000
Debt instrument, interest rate		3.80%								3.80%	3.80%
Term Loan B [Member] \| Interest Rate Swap [Member]
Debt Instrument [Line Items]
Notional amount		$ 900,000,000								$ 900,000,000	$ 900,000,000
Term Loan B [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedges [Member]
Debt Instrument [Line Items]
Notional amount		$ 1,900,000,000								$ 1,900,000,000	$ 1,900,000,000
Weighted Average fixed interest rate		1.821%								1.821%	1.821%
5.75% Operating Partnership Senior Notes, Due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity year								2027
Long-term debt, principal amount								$ 750,000,000
Long-term debt, interest rate (as a percent)								5.75%
5.75% Operating Partnership Senior Notes, Due 2027 [Member] \| Empire City [Member] \| Bridge Facility [Member]
Debt Instrument [Line Items]
Long-term debt, maturity year											2027
Long-term debt, principal amount		$ 246,000,000								$ 246,000,000	$ 246,000,000
Long-term debt, interest rate (as a percent)		5.75%								5.75%	5.75%
5.25% Senior Notes, Due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity year		2020				2020						2020
Long-term debt, principal amount												$ 500,000,000
Long-term debt, interest rate (as a percent)		5.25%				5.25%				5.25%	5.25%	5.25%
Redemption of senior notes		$ 267,000,000
Long-term debt, aggregate principal amount of debt purchased						$ 233,000,000
6.75% Senior Notes, Due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity year		2020				2020						2020
Long-term debt, principal amount												$ 1,000,000,000
Long-term debt, interest rate (as a percent)		6.75%				6.75%				6.75%	6.75%	6.75%
Redemption of senior notes		$ 361,000,000
Long-term debt, aggregate principal amount of debt purchased						$ 639,000,000
6.625% Senior Notes, Due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity year		2021										2021
Long-term debt, principal amount												$ 1,250,000,000
Long-term debt, interest rate (as a percent)		6.625%								6.625%	6.625%	6.625%
Redemption of senior notes		$ 1,250,000,000
5.5% Senior Notes, Due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity year						2027					2027
Long-term debt, principal amount		$ 1,000,000,000				$ 1,000,000,000.0				$ 1,000,000,000	$ 1,000,000,000
Long-term debt, interest rate (as a percent)		5.50%				5.50%				5.50%	5.50%
8.625% Senior Notes, Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity year							2019					2019
Long-term debt, principal amount												$ 850,000,000
Long-term debt, interest rate (as a percent)							8.625%					8.625%
Repayments of senior notes							$ 850,000,000
5.75% Senior Notes, Due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity year									2025		2025	2025
Long-term debt, principal amount		$ 1,000,000,000							$ 1,000,000,000.0	$ 1,000,000,000	$ 1,000,000,000	$ 1,000,000,000
Long-term debt, interest rate (as a percent)		5.75%							5.75%	5.75%	5.75%	5.75%
5.750% Senior Notes, Due 2025 [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Long-term debt, maturity year	2025
Long-term debt, interest rate (as a percent)	5.75%
5.750% Senior Notes, Due 2025 [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount of debt purchased	$ 750,000,000
4.625% Senior Notes, Due 2026 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity year											2026	2026
Long-term debt, principal amount		$ 500,000,000								$ 500,000,000	$ 500,000,000	$ 500,000,000
Long-term debt, interest rate (as a percent)		4.625%								4.625%	4.625%	4.625%
4.625% Senior Notes, Due 2026 [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Long-term debt, maturity year	2026
Long-term debt, interest rate (as a percent)	4.625%
4.625% Senior Notes, Due 2026 [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount of debt purchased	$ 750,000,000
5.500% Senior Notes, Due 2027 [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Long-term debt, maturity year	2027
Long-term debt, interest rate (as a percent)	5.50%
5.500% Senior Notes, Due 2027 [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount of debt purchased	$ 750,000,000
5.375% MGM China Senior Notes, Due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity year					2024						2024
Long-term debt, principal amount		$ 750,000,000			$ 750,000,000					$ 750,000,000	$ 750,000,000
Long-term debt, interest rate (as a percent)		5.375%			5.375%					5.375%	5.375%
5.875% MGM China Senior Notes, Due 2026 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity year					2026						2026
Long-term debt, principal amount		$ 750,000,000			$ 750,000,000					$ 750,000,000	$ 750,000,000
Long-term debt, interest rate (as a percent)		5.875%			5.875%					5.875%	5.875%
Senior Credit Facility [Member] \| Term Loan A [Member]
Debt Instrument [Line Items]
Repayments of term loan			$ 750,000,000
Senior Credit Facility [Member] \| Term Loan B [Member] \| MGP BREIT Venture [Member] \| Operating Partnership Senior Credit Facility [Member]
Debt Instrument [Line Items]
Repayments of term loan											$ 1,300,000,000
MGM China Credit Facility [Member]
Debt Instrument [Line Items]
Current portion of long-term debt, net of debt issuance costs												$ 43,000,000
Credit facility amount		$ 667,404,000								$ 667,404,000	667,404,000	$ 2,433,562,000
MGM China Credit Facility [Member] \| Other Nonoperating Income (Expense) [Member]
Debt Instrument [Line Items]
Loss on early retirement of debt					$ 16,000,000
Revolving Credit Facility [Member] \| Operating Partnership Senior Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility		1,350,000,000								1,350,000,000	$ 1,350,000,000
Long-term debt, maturity year											2023
Line of credit facility drawn		0								0	$ 0
Revolving Credit Facility [Member] \| MGM China Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maturity date				2024-05
Revolving Credit Facility [Member] \| Hong Kong Interbank Offered Rate HIBOR [Member] \| MGM China Credit Facility [Member]
Debt Instrument [Line Items]
Variable interest rate base				HIBOR
Revolving Credit Facility [Member] \| Minimum [Member] \| Hong Kong Interbank Offered Rate HIBOR [Member] \| MGM China Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)				1.625%
Revolving Credit Facility [Member] \| Maximum [Member] \| Hong Kong Interbank Offered Rate HIBOR [Member] \| MGM China Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)				2.75%
Revolving Credit Facility [Member] \| Senior Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility		1,500,000,000								1,500,000,000	$ 1,500,000,000
Long-term debt, maturity year											2023
Line of credit facility drawn		0								0	$ 0
Revolving Credit Facility [Member] \| Senior Credit Facility [Member] \| Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)											1.50%
Revolving Credit Facility [Member] \| Senior Credit Facility [Member] \| Maximum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)											2.25%
Unsecured Revolving Credit Facility [Member] \| MGM China Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility		1,250,000,000								1,250,000,000	$ 1,250,000,000
Line of credit facility drawn				$ 776,000,000
Credit facility amount				$ 1,250,000,000
Unsecured Revolving Credit Facility [Member] \| Senior Credit Facility [Member] \| MGP BREIT Venture [Member]
Debt Instrument [Line Items]
Line of credit facility		$ 1,500,000,000								$ 1,500,000,000	$ 1,500,000,000
Credit facility, maturity date											2025-02
Term Loan [Member] \| MGM China Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate		4.95%								4.95%	4.95%
Repayments of previous term loan											$ 1,000,000.0
Revolving credit facility outstanding											$ 667,000,000