INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013	Nov. 30, 2012	May 31, 2013
Income Taxes [Abstract]
Effective income tax rate	20.30%	21.30%	19.10%	22.90%
Net deferred tax assets	$ 1,400		$ 1,400		$ 1,500