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Supplemental Cash Flow Information -Supplemental Cash Flow (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Supplemental Cash Flow Information [Abstract]      
Interest (net of capitalized interest) $ 524 $ 484 $ 321
Income taxes 760 397 996
Income tax refunds received (571) (20) (5)
Cash tax payments, net $ 189 $ 377 $ 991