Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Oct. 31, 2025	Jul. 31, 2025	Oct. 31, 2024	Jul. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Before Tax:
Net other comprehensive income (loss)		$ 15		$ (28)		$ 58	$ (74)
Tax Effect:
Net other comprehensive income (loss)		(1)		1		(8)	4
Net of Tax:
Net other comprehensive income (loss)		14	$ 36	(27)	$ (43)	50	(70)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Before Tax:
Net gain (loss)		9		(27)		37	(71)
Reclassification to earnings		0		0		0	0
Net other comprehensive income (loss)		9		(27)		37	(71)
Tax Effect:
Net gain (loss)		0		1		(3)	3
Reclassification to earnings		0		0		0	0
Net other comprehensive income (loss)		0		1		(3)	3
Net of Tax:
Net gain (loss)		9		(26)		34	(68)
Reclassification to earnings		0		0		0	0
Net other comprehensive income (loss)		9		(26)		34	(68)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Before Tax:
Net gain (loss)		(1)		(2)		(1)	(1)
Reclassification to earnings	[1]	4		1		7	(3)
Net other comprehensive income (loss)		3		(1)		6	(4)
Tax Effect:
Net gain (loss)		0		0		0	0
Reclassification to earnings	[1]	(1)		0		(2)	1
Net other comprehensive income (loss)		(1)		0		(2)	1
Net of Tax:
Net gain (loss)		(1)		(2)		(1)	(1)
Reclassification to earnings	[1]	3		1		5	(2)
Net other comprehensive income (loss)		2		(1)		4	(3)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Before Tax:
Net gain (loss)		(1)		0		(9)	0
Reclassification to earnings	[2]	4		0		24	1
Net other comprehensive income (loss)		3		0		15	1
Tax Effect:
Net gain (loss)		0		0		2	0
Reclassification to earnings	[2]	0		0		(5)	0
Net other comprehensive income (loss)		0		0		(3)	0
Net of Tax:
Net gain (loss)		(1)		0		(7)	0
Reclassification to earnings	[2]	4		0		19	1
Net other comprehensive income (loss)		$ 3		$ 0		$ 12	$ 1

[1] Pre-tax amount for each period is classified as sales in the accompanying condensed consolidated statements of operations.

[2] Pre-tax amount for each period is classified as non-operating postretirement expense in the accompanying condensed consolidated statements of operations.