Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2021
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS CityCenter Management agreements. Until the Company's acquisition of CityCenter in September 2021, the Company was party to a management agreement pursuant to which it managed the operations of CityCenter for a fee of 2% of revenue and 5% of EBITDA (as defined within the management agreement) for Aria and Vdara. The Company earned fees of $29 million, $16 million and $48 million during the years ended December 31, 2021, 2020, and 2019, respectively. The Company incurred costs reimbursable by CityCenter, primarily for employee compensation and certain allocated costs in performing the Company's management services, of $187 million, $212 million and $420 million during the years ended December 31, 2021, 2020, and 2019, respectively. As of December 31, 2020, CityCenter owed the Company $39 million for management services and reimbursable costs recorded in “Accounts receivable, net” on the consolidated balance sheets. The management agreement was terminated in connection with the Company's acquisition of CityCenter, as discussed in Note 4. MGM China Ms. Ho, Pansy Catilina Chiu King (“Ms. Ho”) is the Co-Chairperson of the Board of Directors of, and holds a minority ownership interest in, MGM China. Ms. Ho is also the managing director of Shun Tak Holdings Limited (together with its subsidiaries “Shun Tak”), a leading conglomerate in Hong Kong with core businesses in transportation, property, hospitality and investments. Shun Tak provides various services and products, including ferry tickets, travel products, rental of hotel rooms, laundry services and property cleaning services to MGM China. In addition, MGM China leases transportation equipment and office space from Shun Tak. MGM China incurred expenses relating to Shun Tak of $7 million, $7 million and $16 million for the years ended December 31, 2021, 2020 and 2019, respectively. In addition, Ms. Ho indirectly holds a 50% interest in an entity that provides, along with its subsidiary, marketing and public relations consulting services, including for the retendering of MGM China's gaming subconcession, to MGM China, which totaled $4 million, $1 million, and $4 million for the years ended December 31, 2021, 2020, and 2019, respectively. Grand Paradise Macau deferred cash payment. On September 1, 2016, the Company purchased 188.1 million common shares of its MGM China subsidiary from Grand Paradise Macau (“GPM”), an entity controlled by Ms. Ho. As part of the consideration for the purchase, the Company agreed to pay GPM or its nominee a deferred cash payment of $50 million. The payments included amounts equal to the ordinary dividends received on such shares, with a final lump sum payment due on the fifth anniversary of the closing date of the transaction, which was made in September 2021. Such amounts were paid to Expert Angels Limited, an entity controlled by an immediate family member of Ms. Ho. As of December 31, 2020, the Company recorded a remaining liability on a discounted basis of $33 million in “Other accrued liabilities” on the consolidated balance sheets. MGM Branding and Development Holdings, Ltd. (together with its subsidiary MGM Development Services, Ltd., “MGM Branding and Development”), an entity included in the Company’s consolidated financial statements in which Ms. Ho indirectly holds a noncontrolling interest, is party to a brand license agreement and a development services agreement with MGM China, for which the related amounts are eliminated in consolidation. An entity owned by Ms. Ho received distributions of $8 million, $5 million and $20 million for the years ended December 31, 2021, 2020 and 2019, respectively, in connection with the ownership of a noncontrolling interest in MGM Branding and Development Holdings, Ltd. MGP As further described in Note 1, pursuant to the master lease with MGP, the Company leases the real estate assets of The Mirage, Luxor, New York-New York, Park MGM, Excalibur, The Park, Gold Strike Tunica, MGM Grand Detroit, Beau Rivage, Borgata, Empire City, MGM National Harbor, MGM Northfield Park, and MGM Springfield from MGP. MGP master lease. The MGP master lease has an initial lease term of 10 years that began on April 25, 2016 (other than with respect to MGM National Harbor, as described below) with the potential to extend the term for four additional 5-year terms thereafter at the option of the Company (with additional renewal options with respect to MGM Springfield, as described below). The MGP master lease provides that any extension of its term must apply to all of the real estate under the master lease at the time of the extension. The MGP master lease provides that the initial term with respect to MGM National Harbor ends on April 31, 2024. Thereafter, the initial term of the MGP master lease with respect to MGM National Harbor may be renewed at the option of the Company for an initial renewal period lasting until the earlier of the end of the then-current term of the master lease or the next renewal term (depending on whether the Company elects to renew the other properties under the master lease in connection with the expiration of the initial 10-year term). If, however, the Company chooses not to renew the lease with respect to MGM National Harbor after the initial MGM National Harbor term under the master lease, the Company would also lose the right to renew the MGP master lease with respect to the rest of the properties when the initial 10-year lease term ends related to the rest of the properties in 2026. In addition to the four 5-year renewal terms, the term of the lease with respect to MGM Springfield may be extended for an additional four 5-year renewal terms. The MGP master lease has a triple-net structure, which requires the Company to pay substantially all costs associated with the lease, including real estate taxes, ground lease payments, insurance, utilities and routine maintenance, in addition to the base rent. Additionally, the master lease provides MGP with a right of first offer with respect to any further gaming development by the Company on the undeveloped land adjacent to Empire City, which MGP may exercise should the Company elect to sell this property in the future. Rent under the MGP master lease consists of a base rent component and a percentage rent component. As of December 31, 2021, the base rent represents approximately 91% of the rent payments due and the percentage rent represents approximately 9% of the rent payments due under the MGP master lease. The MGP master lease also provides for fixed annual escalators of 2% on the base rent through the sixth lease year and the possibility for additional 2% increases thereafter subject to the tenant and operating subsidiary sublessee, collectively, meeting an adjusted net revenue to rent ratio, as well as potential increases in percentage rent in year six and every five years thereafter based on a percentage of average actual annual net revenue during the preceding five year period calculated in accordance with the terms under the master lease. With respect to the additional renewal terms for MGM Springfield, for the first two additional renewal terms, base rent will include a fixed annual rent escalator of 2.0%, subject to the adjusted net revenue to rent ratio, as discussed above. For each lease year subsequent to the first two additional renewal terms, the base rent shall be the Fair Market Rent (as defined in the MGP master lease) in respect of MGM Springfield. The MGP master lease also contains customary events of default and financial covenants; provided that the tenant will not be in default of the financial covenants in the event there is an unavoidable delay (as such term is defined in the lease). The Company was in compliance with all applicable covenants as of December 31, 2021. Subsequent to the Company completing its acquisition of Empire City in January 2019, MGP acquired the developed real property associated with Empire City from the Company for consideration of approximately $634 million, which included the assumption of debt of approximately $246 million, which was immediately repaid, and the remainder in issuance of Operating Partnership units. The real estate assets of Empire City were then leased to the Company pursuant to an amendment to the MGP master lease, increasing the annual rent payment to MGP by $50 million, prorated for the remainder of the lease year. Consistent with the MGP master lease terms, 90% of this rent will be fixed and contractually grow at 2% per year until 2022. As disclosed above, the master lease provides MGP with a right of first offer with respect to certain undeveloped land adjacent to the property to the extent the Company develops additional gaming facilities, which MGP may exercise should the Company elect to sell this property in the future. On March 7, 2019, the Company entered into an amendment to the existing MGP master lease with respect to the Park MGM Transaction. In connection with the transaction, the Company received consideration of $638 million, of which approximately $606 million was paid in cash and the remainder in issuance of Operating Partnership units. Additionally, the annual rent payment to MGP was increased by $50 million, prorated for the remainder of the lease year. Consistent with the master lease terms, 90% of this rent will be fixed and contractually grow at 2% per year until 2022. Additionally, on April 1, 2019, the Company acquired the membership interests of Northfield from MGP, which held the operations of Northfield, for fair value of consideration of approximately $305 million consisting primarily of approximately 9 million Operating Partnership units that were ultimately redeemed by the Operating Partnership, and MGP retained the associated real estate assets. The Company then rebranded the property to MGM Northfield Park, which was then added to the existing MGP master lease with MGP, increasing the annual rent payment to MGP by $60 million. Consistent with the master lease terms, 90% of this rent will be fixed and contractually grow at 2% per year until 2022. The annual rent payments under the MGP master lease for the fourth lease year, which commenced on April 1, 2019, increased to $946 million from $770 million at the start of the third lease year. The increase was a result of the $50 million in additional rent for each of the Park MGM Transaction and the addition of Empire City in the beginning of 2019, the $60 million of additional rent for MGM Northfield Park, which entered the Master Lease on April 1, 2019, as well as the third 2% fixed annual rent escalator that went into effect on April 1, 2019. On February 14, 2020, the Company amended the MGP master lease to remove Mandalay Bay from such master lease and the annual rent under the MGP master lease was reduced by $133 million to $813 million. The annual cash rent payments under the MGP master lease for the fifth lease year, which commenced on April 1, 2020, increased to $828 million from $813 million, as a result of the fourth 2% fixed annual rent escalator that went into effect on April 1, 2020. The annual cash rent payments under the MGP master lease for the sixth lease year, which commenced on April 1, 2021, increased to $843 million from $828 million, as a result of the fifth 2% fixed annual rent escalator that went into effect on April 1, 2021. In October 2021, MGP acquired the real estate assets of MGM Springfield from the Company for $400 million of cash consideration, which was accounted for as a transaction between entities under common control. The Company adjusted the carrying value of noncontrolling interests to adjust for its share of the difference between the carrying value of the net assets transferred and the consideration received, with offsetting adjustments to capital in excess of par value. MGM Springfield was added to the master lease between the Company and MGP. Following the closing of the transaction, the annual rent payment to MGP increased from $843 million to $873 million, reflecting the addition of MGM Springfield, which increased the annual rent payment by $30 million, $27 million of which will be fixed and contractually grow at 2% per year with escalators subject to the adjusted net revenue to rent ratio, as further described above. Final regulatory approvals, which were not necessary for the transaction to close, are expected to be received within nine to twelve months following the close of the transaction. Until final regulatory approvals are obtained, the parties will be subject to a trust agreement, which provides for the property to go into a trust (or, at the Company’s option, be returned to the Company) during the interim period in the event that the regulator finds reasonable cause to believe that MGP may not be found suitable. The property will then remain in trust until a final determination regarding MGP’s suitability is made. Additionally, refer to Note 1 for discussion relating to the waiver agreement with MGP and the Operating Partnership units redeemed in 2020 thereunder. All intercompany transactions, including transactions under the MGP master lease, have been eliminated in the Company’s consolidation of MGP. The public ownership of MGP’s Class A shares is recognized as noncontrolling interests in the Company’s consolidated financial statements. As further described in Note 1, in August 2021, the Company entered into an agreement with VICI and MGP whereby VICI will acquire MGP in a stock-for-stock transaction. As part of the transaction, the Company will enter into an amended and restated master lease with VICI. The transaction is expected to close in the first half of 2022, subject to customary closing conditions, regulatory approvals, and approval by VICI stockholders (which was obtained on October 29, 2021). Bellagio BREIT Venture The Company has a 5% ownership interest in Bellagio BREIT Venture, which owns the real estate assets of Bellagio and leases such assets to a subsidiary of the Company pursuant to a lease agreement. Refer to Note 11 for further information related to the Bellagio lease. MGP BREIT Venture MGP has a 50.1% ownership interest in MGP BREIT Venture, which owns the real estate assets of Mandalay Bay and MGM Grand Las Vegas and leases such assets to a subsidiary of the Company pursuant to a lease agreement. Refer to Note 11 for further information related to the Mandalay Bay and MGM Grand Las Vegas lease.