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Equity method investments - carrying value (Details) - USD ($)
$ in Millions
Aug. 31, 2018
Aug. 31, 2017
Schedule of Equity Method Investments [Line Items]    
Carrying value $ 6,610 $ 6,320
AmerisourceBergen    
Schedule of Equity Method Investments [Line Items]    
Carrying value $ 5,138 $ 5,024
Ownership percentage 26.00% 26.00%
Others    
Schedule of Equity Method Investments [Line Items]    
Carrying value $ 1,472 $ 1,296
Others | Minimum    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 8.00% 8.00%
Others | Maximum    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 50.00% 50.00%