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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Supplemental Cash Flow Information [Abstract]    
Interest (net of capitalized interest) $ 146 $ 103
Income taxes 831 760
Income tax refunds received (3) (5)
Cash tax payments, net $ 828 $ 755