Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended
		Jul. 31, 2022	Jul. 31, 2021
Before Tax:
Net other comprehensive income (loss)		$ 8	$ 16
Tax Effect:
Net other comprehensive income (loss)		(7)	(8)
Net of Tax:
Net other comprehensive income (loss)		1	8
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Before Tax:
Net gain (loss)		(1)	(8)
Reclassification to earnings		0	0
Net other comprehensive income (loss)		(1)	(8)
Tax Effect:
Net gain (loss)		(4)	(2)
Reclassification to earnings		0	0
Net other comprehensive income (loss)		(4)	(2)
Net of Tax:
Net gain (loss)		(5)	(10)
Reclassification to earnings		0	0
Net other comprehensive income (loss)		(5)	(10)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Before Tax:
Net gain (loss)		14	15
Reclassification to earnings	[1]	(8)	3
Net other comprehensive income (loss)		6	18
Tax Effect:
Net gain (loss)		(4)	(3)
Reclassification to earnings	[1]	2	(1)
Net other comprehensive income (loss)		(2)	(4)
Net of Tax:
Net gain (loss)		10	12
Reclassification to earnings	[1]	(6)	2
Net other comprehensive income (loss)		4	14
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Before Tax:
Net gain (loss)		0	0
Reclassification to earnings	[2]	3	6
Net other comprehensive income (loss)		3	6
Tax Effect:
Net gain (loss)		0	0
Reclassification to earnings	[2]	(1)	(2)
Net other comprehensive income (loss)		(1)	(2)
Net of Tax:
Net gain (loss)		0	0
Reclassification to earnings	[2]	2	4
Net other comprehensive income (loss)		$ 2	$ 4

[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.