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Supplemental Cash Flow Information
 9 Months Ended
Feb. 29, 2016
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Information

(9) Supplemental Cash Flow Information

Cash paid for interest expense and income taxes for the nine-month periods ended February 29, 2016 and February 28, 2015 was as follows (in millions):

    2016 2015   
Cash payments for:         
 Interest (net of capitalized interest) $ 284 $ 196   
            
 Income taxes $ 919 $ 859   
 Income tax refunds received   (3)   (7)   
 Cash tax payments, net $ 916 $ 852