Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended						9 Months Ended
		Jan. 31, 2024	Oct. 31, 2023	Jul. 31, 2023	Jan. 31, 2023	Oct. 31, 2022	Jul. 31, 2022	Jan. 31, 2024	Jan. 31, 2023
Before Tax:
Net other comprehensive income (loss)		$ 52			$ 75			$ 4	$ 92
Tax Effect:
Net other comprehensive income (loss)		14			16			7	2
Net of Tax:
Net other comprehensive income (loss)		66	$ (91)	$ 36	91	$ 2	$ 1	11	94
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Before Tax:
Net gain (loss)		61			111			0	110
Reclassification to earnings		4			0			4	0
Net other comprehensive income (loss)		65			111			4	110
Tax Effect:
Net gain (loss)		4			8			0	(2)
Reclassification to earnings		6			0			6	0
Net other comprehensive income (loss)		10			8			6	(2)
Net of Tax:
Net gain (loss)		65			119			0	108
Reclassification to earnings		10			0			10	0
Net other comprehensive income (loss)		75			119			10	108
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Before Tax:
Net gain (loss)		(11)			(33)			6	3
Reclassification to earnings	[1]	(3)			(11)			(11)	(34)
Net other comprehensive income (loss)		(14)			(44)			(5)	(31)
Tax Effect:
Net gain (loss)		3			7			(1)	(1)
Reclassification to earnings	[1]	1			3			3	8
Net other comprehensive income (loss)		4			10			2	7
Net of Tax:
Net gain (loss)		(8)			(26)			5	2
Reclassification to earnings	[1]	(2)			(8)			(8)	(26)
Net other comprehensive income (loss)		(10)			(34)			(3)	(24)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Before Tax:
Net gain (loss)		0			(21)			0	(21)
Reclassification to earnings	[2]	1			29			5	34
Net other comprehensive income (loss)		1			8			5	13
Tax Effect:
Net gain (loss)		0			5			0	5
Reclassification to earnings	[2]	0			(7)			(1)	(8)
Net other comprehensive income (loss)		0			(2)			(1)	(3)
Net of Tax:
Net gain (loss)		0			(16)			0	(16)
Reclassification to earnings	[2]	1			22			4	26
Net other comprehensive income (loss)		$ 1			$ 6			$ 4	$ 10

[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.