Share-based compensation - Summary of Time Vested, Performance Vested and Long-Term Incentive Awards (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Oct. 31, 2024 USD ($) $ / shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair value of awards vested | $	$ 81
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	$ 187.53