Income Taxes - Sources of income from continuing operations (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022
Income Tax Disclosure [Abstract]
United States	$ 3,449	$ 2,798	$ 2,433
Foreign	101	191	109
Income before income taxes	$ 3,550	$ 2,989	$ 2,542