BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended
	Sep. 22, 2011	Mar. 31, 2013
Income tax provision and related items
Reduction in unrecognized tax benefits as a result of settlement		$ 28
Reduction in provision for income taxes as a result of settlement		38
U.S. Federal
Income tax provision and related items
Increase in provision for income taxes for deferred tax asset valuation allowance		9
MGM Grand Paradise SA | Macau tax law
Income tax provision and related items
Complementary tax rate (as a percent)		12.00%
Period exempted from complementary tax, second exemption period granted	5 years
Additional and third exemption period from complementary tax assumed based on third exemption period granted to a competitor		5 years
Increase in deferred tax liability/provision for income taxes		$ 65