COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified			0 Months Ended					1 Months Ended			3 Months Ended	1 Months Ended			3 Months Ended
	Mar. 31, 2013 Cotai land concession contract	Mar. 31, 2013 Cotai land concession contract MGM China	Jan. 09, 2013 Cotai land concession contract MGM Grand Paradise SA item	Oct. 18, 2012 Cotai land concession contract MGM Grand Paradise SA acre	Mar. 31, 2013 Senior credit facility	Mar. 31, 2013 Senior credit facility Letters of credit	Mar. 31, 2013 Guarantees MGM credit facility MGM China	Aug. 31, 2012 CityCenter Holdings, LLC Pending Litigation Perini construction agreement	Apr. 30, 2010 CityCenter Holdings, LLC Pending Litigation Perini construction agreement	Mar. 31, 2010 CityCenter Holdings, LLC Pending Litigation Perini construction agreement	Mar. 31, 2013 CityCenter Holdings, LLC Pending Litigation Perini construction agreement subcontractor	Jan. 31, 2011 CityCenter Holdings, LLC Completion guarantee	Mar. 31, 2013 CityCenter Holdings, LLC Completion guarantee	Mar. 31, 2013 CityCenter Holdings, LLC Completion guarantee Harmon	Mar. 31, 2013 CityCenter Holdings, LLC Completion guarantee Harmon Maximum
COMMITMENTS AND CONTINGENCIES
Damages sought								$ 191	$ 491	$ 490
Number of subcontractors whose claims are resolved											215
Number of remaining subcontractors whose claims are not resolved											7
Number of subcontractors implicated in the defective work at the Harmon											3
Net residential proceeds to fund or reimburse construction costs												124
Remaining condo proceeds available to fund or reimburse construction costs held in separate bank account													112
Amount funded under completion guarantee													698
Remaining estimated net obligation under the completion guarantee													21
Amounts claimed by general contractor and certain subcontractors exceed amounts included in the completion guarantee accrual													154
Cash and cash equivalents, amount that could be used as funding source for demolition or repair expenses															30
Current estimate, demolition														32
Area of development site (in acres)				17.8
Initial term of contract			25 years
Payable for land concession contract		118	161
Number of semi-annual payments			8
Contract premium, initial down payment recorded within other long-term assets		56
Accumulated amortization of concession contract premium	2
Amount that can be issued						500
Total letters of credit					35
Guarantees provided							$ 39