Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended						9 Months Ended
		Jan. 31, 2023	Oct. 31, 2022	Jul. 31, 2022	Jan. 31, 2022	Oct. 31, 2021	Jul. 31, 2021	Jan. 31, 2023	Jan. 31, 2022
Before Tax:
Net other comprehensive income (loss)		$ 75			$ 4			$ 92	$ 30
Tax Effect:
Net other comprehensive income (loss)		16			(10)			2	(26)
Net of Tax:
Net other comprehensive income (loss)		91	$ 2	$ 1	(6)	$ 2	$ 8	94	4
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Before Tax:
Net gain (loss)		111			(23)			110	(40)
Reclassification to earnings		0			0			0	0
Net other comprehensive income (loss)		111			(23)			110	(40)
Tax Effect:
Net gain (loss)		8			(4)			(2)	(9)
Reclassification to earnings		0			0			0	0
Net other comprehensive income (loss)		8			(4)			(2)	(9)
Net of Tax:
Net gain (loss)		119			(27)			108	(49)
Reclassification to earnings		0			0			0	0
Net other comprehensive income (loss)		119			(27)			108	(49)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Before Tax:
Net gain (loss)		(33)			23			3	53
Reclassification to earnings	[1]	(11)			(2)			(34)	(1)
Net other comprehensive income (loss)		(44)			21			(31)	52
Tax Effect:
Net gain (loss)		7			(5)			(1)	(12)
Reclassification to earnings	[1]	3			0			8	0
Net other comprehensive income (loss)		10			(5)			7	(12)
Net of Tax:
Net gain (loss)		(26)			18			2	41
Reclassification to earnings	[1]	(8)			(2)			(26)	(1)
Net other comprehensive income (loss)		(34)			16			(24)	40
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Before Tax:
Net gain (loss)		(21)			0			(21)	(1)
Reclassification to earnings	[2]	29			6			34	19
Net other comprehensive income (loss)		8			6			13	18
Tax Effect:
Net gain (loss)		5			0			5	0
Reclassification to earnings	[2]	(7)			(1)			(8)	(5)
Net other comprehensive income (loss)		(2)			(1)			(3)	(5)
Net of Tax:
Net gain (loss)		(16)			0			(16)	(1)
Reclassification to earnings	[2]	22			5			26	14
Net other comprehensive income (loss)		$ 6			$ 5			$ 10	$ 13

[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.