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Related parties (Tables)
6 Months Ended
Feb. 29, 2020
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
Related party transactions with AmerisourceBergen (in millions):
 Three months endedSix months ended
 February 29, 2020February 28, 2019February 29, 2020February 28, 2019
Purchases, net$14,932  $14,064  $29,408  $28,386  

 February 29, 2020August 31, 2019
Trade accounts payable, net$6,747  $6,484