Income Taxes	3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 5 — INCOME TAXES For interim income tax reporting the Company estimates its annual effective tax rate and applies it to its year-to-date ordinary income. The tax effects of unusual or infrequently occurring items, including changes in judgment about valuation allowances and effects of changes in tax laws or rates, are reported in the interim period in which they occur. The Company’s effective income tax rate was a benefit of 22.0% on loss before income taxes and a provision of 28.0% on income before income taxes for the three months ended March 31, 2021 and 2020, respectively. The Company recognizes deferred income tax assets, net of applicable reserves, related to net operating losses, tax credit carryforwards and certain temporary differences. The Company recognizes future tax benefits to the extent that realization of such benefit is more likely than not. Otherwise, a valuation allowance is applied. The Company decreased its valuation allowance for its foreign tax credits (“FTCs”) by $3 million in the three months ended March 31, 2021 with a corresponding increase to benefit for income taxes. The Company's FTCs are attributable to the Macau Special Gaming Tax, which is 35% of gross gaming revenue in Macau. Significant judgment is required in assessing the need for a valuation allowance and future changes to assumptions used in this assessment could result in material changes in the valuation allowance with a corresponding impact on the provision for income taxes in the period including such change. MGM Grand Paradise’s application for an extension of its annual fee arrangement with Macau covering distributions of gaming profits to be earned through June 26, 2022 is still pending. Until the extension is granted, the 12% complementary tax will accrue on distributions of gaming profits earned after March 31, 2020; however, no amounts are accrued for the three months ended March 31, 2021 since MGM Grand Paradise continues to generate losses due to the impact of COVID-19. During the three months ended March 31, 2021 one of the Company's subsidiaries, Marina District Development Company, LLC, closed an examination in the state of New Jersey for tax years 2015 through 2018 with no change in tax due. As a result of the audit closure, the Company reversed $10 million of unrecognized tax benefits during the quarter. The Company believes it is reasonably possible that it will reverse an additional $20 million of unrecognized tax benefits within the next twelve months on the expectation during such period of a settlement with IRS Appeals for issues outstanding on the Company's 2014 U.S. consolidated federal income tax return.

Income Taxes

3 Months Ended

Mar. 31, 2021

NOTE 5 — INCOME TAXES

For interim income tax reporting the Company estimates its annual effective tax rate and applies it to its year-to-date ordinary income. The tax effects of unusual or infrequently occurring items, including changes in judgment about valuation allowances and effects of changes in tax laws or rates, are reported in the interim period in which they occur. The Company’s effective income tax rate was a benefit of 22.0% on loss before income taxes and a provision of 28.0% on income before income taxes for the three months ended March 31, 2021 and 2020, respectively.

The Company recognizes deferred income tax assets, net of applicable reserves, related to net operating losses, tax credit carryforwards and certain temporary differences. The Company recognizes future tax benefits to the extent that realization of such benefit is more likely than not. Otherwise, a valuation allowance is applied.

The Company decreased its valuation allowance for its foreign tax credits (“FTCs”) by $3 million in the three months ended March 31, 2021 with a corresponding increase to benefit for income taxes. The Company's FTCs are attributable to the Macau Special Gaming Tax, which is 35% of gross gaming revenue in Macau. Significant judgment is required in assessing the need for a valuation allowance and future changes to assumptions used in this assessment could result in material changes in the valuation allowance with a corresponding impact on the provision for income taxes in the period including such change.

MGM Grand Paradise’s application for an extension of its annual fee arrangement with Macau covering distributions of gaming profits to be earned through June 26, 2022 is still pending. Until the extension is granted, the 12% complementary tax will accrue on distributions of gaming profits earned after March 31, 2020; however, no amounts are accrued for the three months ended March 31, 2021 since MGM Grand Paradise continues to generate losses due to the impact of COVID-19.

During the three months ended March 31, 2021 one of the Company's subsidiaries, Marina District Development Company, LLC, closed an examination in the state of New Jersey for tax years 2015 through 2018 with no change in tax due. As a result of the audit closure, the Company reversed $10 million of unrecognized tax benefits during the quarter. The Company believes it is reasonably possible that it will reverse an additional $20 million of unrecognized tax benefits within the next twelve months on the expectation during such period of a settlement with IRS Appeals for issues outstanding on the Company's 2014 U.S. consolidated federal income tax return.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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