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Consolidated Statements of Comprehensive Income(Parentheticals) - USD ($)
$ in Millions
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Other Comprehensive Income, Tax Amounts      
Foreign currency translation adjustments, tax $ 45 $ 1 $ 12
Amortization of unrealized pension actuarial gains/losses and other, tax $ (1) $ 38 $ 51