Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2026	Jan. 31, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Sponsor Location [Extensible List]	United States [Member]	United States [Member]	United States [Member]	United States [Member]
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 3	$ 4	$ 10	$ 13
Interest cost	8	9	23	27
Expected return on plan assets	(8)	(10)	(25)	(29)
Amortization of prior service cost (credit)	0	0	1	1
Amortization of net actuarial loss (gain)	1	1	3	1
Curtailment loss	0	1	0	1
Settlement charge	1	0	22	0
Net cost	5	5	34	14
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	0	0	1	1
Special termination benefits	0	1	0	1
Curtailment loss	0	1	0	1
Net cost	$ 0	$ 2	$ 1	$ 3