Leases Lease Cost and Other Information (Details) - USD ($) $ in Millions		12 Months Ended
		Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Leases [Abstract]
Total lease cost	[1]	$ 38	$ 38	$ 41
Cash paid for amounts included in the measurement of lease liabilities	[2]	25	25	26
Right-of-use assets obtained in exchange for new lease liabilities		$ 29	$ 35	$ 25

[1] Consists primarily of operating lease cost. Other components of lease cost were not material.

[2] Classified within operating activities in the accompanying consolidated statements of cash flows.