Debt - Summary of senior unsecured debt (Details) - USD ($) $ in Millions	Jul. 31, 2024	Jul. 31, 2023
Total principal balance of debt
Total principal balance of debt	$ 6,085	$ 6,130
Unamortized discount and debt issuance costs	(47)	(10)
Net carrying value of debt	6,038	6,120
Short-term debt	499	0
Long-term debt	5,539	6,120
Term loan
Total principal balance of debt
Total principal balance of debt	0	4,200
Senior Unsecured Notes | The Notes
Total principal balance of debt
Net carrying value of debt	1,500
Senior Unsecured Notes | 0.950% notes due July 2025
Total principal balance of debt
Total principal balance of debt	$ 500	500
Stated interest rate (in percent)	0.95%
Effective interest rate (in percent)	1.127%
Senior Unsecured Notes | 1.350% notes due July 2027
Total principal balance of debt
Total principal balance of debt	$ 500	500
Stated interest rate (in percent)	1.35%
Effective interest rate (in percent)	1.486%
Senior Unsecured Notes | 1.650% notes due July 2030
Total principal balance of debt
Total principal balance of debt	$ 500	500
Stated interest rate (in percent)	1.65%
Effective interest rate (in percent)	1.767%
Senior Unsecured Notes | 5.250% notes due September 2026
Total principal balance of debt
Total principal balance of debt	$ 750	0
Stated interest rate (in percent)	5.25%
Effective interest rate (in percent)	5.325%
Senior Unsecured Notes | 5.125% notes due September 2028
Total principal balance of debt
Total principal balance of debt	$ 750	0
Stated interest rate (in percent)	5.125%
Effective interest rate (in percent)	5.258%
Senior Unsecured Notes | 5.200% notes due September 2033
Total principal balance of debt
Total principal balance of debt	$ 1,250	0
Stated interest rate (in percent)	5.20%
Effective interest rate (in percent)	5.312%
Senior Unsecured Notes | 5.500% notes due September 2053
Total principal balance of debt
Total principal balance of debt	$ 1,250	0
Stated interest rate (in percent)	5.50%
Effective interest rate (in percent)	5.576%
Line of Credit | Revolving Credit Facility | Subsidiary
Total principal balance of debt
Secured revolving credit facilities	$ 585	$ 430