Supplemental information - Depreciation and Amortization Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2023	May 31, 2022
Supplemental Cash Flow Elements [Abstract]
Depreciation expense	$ 372	$ 331	$ 1,068	$ 1,014
Intangible assets amortization	226	148	583	488
Total depreciation and amortization expense	$ 598	$ 478	$ 1,652	$ 1,502