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Supplemental Cash Flow Information -Supplemental Cash Flow (Details) - USD ($)
$ in Millions
6 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Supplemental Cash Flow Information [Abstract]    
Interest (net of capitalized interest) $ 308 $ 238
Income taxes 220 617
Income tax refunds received (6) (19)
Cash tax payments, net $ 214 $ 598