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Financial instruments - warrants (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 25, 2016
Mar. 18, 2016
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
AmerisourceBergen          
Warrants [Abstract]          
Warrant to purchase common stock (in shares) 22,696,912 22,696,912      
Warrant exercise price (in dollars per share) $ 52.50 $ 51.50      
Warrants aggregate exercise price payment $ 1,190 $ 1,170      
Warrants | Other income (expense)          
Warrants [Abstract]          
Gains and losses due to changes in fair value of derivative instruments     $ 0 $ 0 $ (546)