LONG-TERM DEBT (Details 2) (USD $)			12 Months Ended		3 Months Ended		3 Months Ended			3 Months Ended						0 Months Ended	3 Months Ended									1 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Senior credit facility	Mar. 31, 2013 Senior credit facility Collateralized land and assets of MGM Grand Detroit MGM Grand Detroit, LLC	Mar. 31, 2013 Senior credit facility Maximum	Mar. 31, 2013 Senior credit facility Maximum Collateralized land and assets of MGM Grand Las Vegas, Bellagio and The Mirage	Mar. 31, 2013 Senior credit facility Quarters ended March 31, 2013 and June 30, 2013 Minimum	Mar. 31, 2013 Senior credit facility Quarters ended September 30, 2013 and December 31, 2013 Minimum	Mar. 31, 2013 Senior credit facility Revolving loans	Mar. 31, 2013 Senior credit facility Revolving loans LIBOR	Mar. 31, 2013 Senior credit facility term loan A	Mar. 31, 2013 Senior credit facility term loan A LIBOR	Mar. 31, 2013 Senior credit facility term loan B	Mar. 31, 2013 Senior credit facility term loan B LIBOR	Mar. 31, 2013 Senior credit facility term loans	Apr. 29, 2013 Amended and restated MGM China credit facility HIBOR MGM China	Mar. 31, 2013 Amended and restated MGM China credit facility HIBOR MGM China	Mar. 31, 2013 Amended and restated MGM China credit facility Minimum MGM China	Mar. 31, 2013 Amended and restated MGM China credit facility Prior to first anniversary of MGM Cotai Opening date Maximum MGM China	Mar. 31, 2013 Amended and restated MGM China credit facility After first anniversary of MGM Cotai Opening date Maximum MGM China	Mar. 31, 2013 Amended and restated MGM China credit facility Prior to April 2013 HIBOR MGM China	Mar. 31, 2013 Amended and restated MGM China credit facility April 2013 and thereafter Minimum HIBOR MGM China	Mar. 31, 2013 Amended and restated MGM China credit facility April 2013 and thereafter Maximum HIBOR MGM China	Mar. 31, 2013 MGM China credit facility, Term loans MGM China	Mar. 31, 2013 MGM China credit facility, revolving credit facility MGM China	Apr. 30, 2013 6.75% senior notes, due 2013	Mar. 31, 2013 6.75% senior notes, due 2013	Dec. 31, 2012 6.75% senior notes, due 2013
LONG-TERM DEBT
Credit facility amount									$ 1,200,000,000		$ 1,050,000,000		$ 1,750,000,000											$ 550,000,000	$ 1,450,000,000
Variable interest rate base										LIBOR		LIBOR		LIBOR		HIBOR	HIBOR
Interest rate margin (as a percent)										3.00%		3.00%		3.25%		1.75%					2.50%	1.75%	2.50%
Interest rate floor (as a percent)														1.00%
Amortization payments of original principal balance (as percent)											0.25%		0.25%
Available borrowing capacity			1,050,000,000
Interest rate at the end of the period (as a percent)									3.18%		3.28%		4.25%
Secured obligations				450,000,000		3,350,000,000
Trailing annual earnings before interest, taxes, depreciation and amortization (EBITDA)			1,200,000,000				1,000,000,000	1,050,000,000
Annual capital expenditures					500,000,000
Consolidated leverage ratio																			4.50	4.00
Consolidated interest coverage ratio																		2.50
Repayments															7,000,000											462,000,000
Long-term debt, interest rate (as a percent)																											6.75%	6.75%
Fair value of long-term debt
Long-term debt, fair value	$ 14,700,000,000	$ 14,300,000,000