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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
6 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Supplemental Cash Flow Information [Abstract]    
Interest (net of capitalized interest) $ 232 $ 146
Income taxes 216 831
Income tax refunds received (13) (3)
Cash tax payments, net $ 203 $ 828