Income Taxes - Sources of income from continuing operations (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Income Tax Disclosure [Abstract]
United States	$ 2,798	$ 2,433	$ 2,497
Foreign	191	109	59
Income before income taxes	$ 2,989	$ 2,542	$ 2,556