Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Retirement Benefits [Abstract]
Defined Benefit Plan, Sponsor Location [Extensible List]	Domestic Plan [Member]	Domestic Plan [Member]	Domestic Plan [Member]	Domestic Plan [Member]
Service cost	$ 4	$ 4	$ 7	$ 8
Interest cost	7	9	15	18
Expected return on plan assets	(8)	(10)	(17)	(19)
Amortization of prior service cost (credit)	1	0	1	0
Amortization of net actuarial loss (gain)	1	1	2	1
Settlement charge	2	0	21	0
Net cost	$ 7	$ 4	$ 29	$ 8