Share-based compensation - Schedule of Time Vested, Performance Vested and Long-Term Incentive Awards (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Apr. 30, 2025 USD ($) $ / shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair value of awards vested | $	$ 83
Time Vested, Performance Vested, and Long Term Incentive Awards
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted-average grant date fair value per share granted (in usd per share) | $ / shares	$ 186.14