Consolidated Statements of Comprehensive (Loss) Income (Parentheticals) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Other Comprehensive (Loss) Income, Tax Amounts
Foreign currency translation adjustments, tax	$ 35	$ (1)	$ (13)
Amortization of prior service credit and other, net of tax	$ 2	$ 3	$ 12