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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Supplemental Cash Flow Information [Abstract]    
Interest (net of capitalized interest) $ 284 $ 196
Income taxes 919 859
Income tax refunds received (3) (7)
Cash tax payments, net $ 916 $ 852