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Related parties (Tables)
12 Months Ended
Aug. 31, 2020
Related Party Transactions [Abstract]  
Schedule of related party transactions
Related party transactions with AmerisourceBergen (in millions):
 202020192018
Purchases, net$59,569 $57,429 $53,161 
Trade accounts payable, net$6,390 $6,484 $6,274