Pension and Other Postretirement Benefits (Details) - Pension Benefits [Member] - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2025	Jul. 31, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Sponsor Location [Extensible List]	Domestic Plan [Member]	Domestic Plan [Member]
Service cost	$ 3	$ 4
Interest cost	8	9
Expected return on plan assets	(9)	(10)
Amortization of net actuarial loss (gain)	1	1
Settlement charge	19	0
Net cost	$ 22	$ 4