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Related parties (Tables)
12 Months Ended
Aug. 31, 2017
Related Party Transactions [Abstract]  
Schedule of related party transactions
Related party transactions (in millions):

 
 
2017
 
2016
 
2015
Purchases, net
 
$
43,571

 
$
41,889

 
$
39,360

 
 
 
 
 
 
 
Trade accounts payable, net
 
$
4,384

 
$
3,456

 
$
2,867