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Equity method investments - carrying value (Details) - USD ($)
$ in Millions
Aug. 31, 2024
Aug. 31, 2023
Schedule of Equity Method Investments [Line Items]    
Carrying value $ 2,269 $ 3,497
Cencora    
Schedule of Equity Method Investments [Line Items]    
Carrying value $ 1,563 $ 2,534
Ownership percentage 10.20% 15.90%
Others    
Schedule of Equity Method Investments [Line Items]    
Carrying value $ 705 $ 963
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%