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Supplemental Cash Flow Information
 6 Months Ended
Nov. 30, 2015
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Information

(9) Supplemental Cash Flow Information

Cash paid for interest expense and income taxes for the six-month periods ended November 30 was as follows (in millions):

    2015 2014   
Cash payments for:         
 Interest (net of capitalized interest) $ 146 $ 103   
            
 Income taxes $ 831 $ 760   
 Income tax refunds received   (3)   (5)   
 Cash tax payments, net $ 828 $ 755