Income Taxes - Unrecognized tax benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefits, beginning balance	$ 216	$ 190	$ 101
Increases related to tax positions from prior fiscal years, including acquisitions	11	9	69
Decreases related to tax positions from prior fiscal years	(16)	(13)	0
Increases related to tax positions taken during current fiscal year	38	31	31
Settlements with tax authorities	(2)	0	0
Lapse of statute of limitations	(1)	(1)	(11)
Gross unrecognized tax benefits, ending balance	$ 246	$ 216	$ 190