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Equity method investments - Schedule of Equity Method Investments (Details) - USD ($)
$ in Millions
Feb. 28, 2025
Nov. 30, 2024
Aug. 31, 2024
Schedule of Equity Method Investments [Line Items]      
Carrying value of equity method investments $ 1,380   $ 2,269
Cencora      
Schedule of Equity Method Investments [Line Items]      
Carrying value of equity method investments $ 980   $ 1,563
Ownership percentage 6.00% 10.00% 10.00%
Others      
Schedule of Equity Method Investments [Line Items]      
Carrying value of equity method investments $ 399   $ 705
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%