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Supplemental Cash Flow Information -Supplemental Cash Flow (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Supplemental Cash Flow Information [Abstract]    
Interest (net of capitalized interest) $ 164 $ 203
Income taxes 55 93
Income tax refunds received (12) (3)
Cash tax payments, net $ 43 $ 90