Leases ROU Assets and Liabilities (Details) - USD ($) $ in Millions	Apr. 30, 2023	Apr. 30, 2022
Leases [Abstract]
Right-of-use assets	$ 84	$ 74
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]
Lease Liabilities:
Current	$ 22	$ 21
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]
Non-current	$ 63	$ 54
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]
Total	$ 85	$ 75
Weighted-average discount rate	3.30%	1.80%
Weighted-average remaining term	5 years 1 month 6 days	5 years