Other Comprehensive Income Schedule of Other Comprehensive Income (Details) - USD ($) $ in Millions		12 Months Ended
		Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Before Tax:
Net other comprehensive income (loss)		$ 113	$ 128	$ 108
Tax Effect:
Net other comprehensive income (loss)		4	(58)	17
Net of Tax:
Net other comprehensive income (loss)		117	70	125
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Before Tax:
Net gain (loss)		135	(42)	106
Reclassification to earnings		0	0	0
Net other comprehensive income (loss)		135	(42)	106
Tax Effect:
Net gain (loss)		0	(18)	17
Reclassification to earnings		0	0	0
Net other comprehensive income (loss)		0	(18)	17
Net of Tax:
Net gain (loss)		135	(60)	123
Reclassification to earnings		0	0	0
Net other comprehensive income (loss)		135	(60)	123
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Before Tax:
Net gain (loss)		3	76	(78)
Reclassification to earnings	[1]	(37)	(7)	(21)
Net other comprehensive income (loss)		(34)	69	(99)
Tax Effect:
Net gain (loss)		(1)	(17)	17
Reclassification to earnings		8	1	6
Net other comprehensive income (loss)		7	(16)	23
Net of Tax:
Net gain (loss)		2	59	(61)
Reclassification to earnings		(29)	(6)	(15)
Net other comprehensive income (loss)		(27)	53	(76)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Before Tax:
Net gain (loss)		(26)	67	71
Reclassification to earnings	[2]	38	34	30
Net other comprehensive income (loss)		12	101	101
Tax Effect:
Net gain (loss)		6	(16)	(16)
Reclassification to earnings		(9)	(8)	(7)
Net other comprehensive income (loss)		(3)	(24)	(23)
Net of Tax:
Net gain (loss)		(20)	51	55
Reclassification to earnings		29	26	23
Net other comprehensive income (loss)		9	77	$ 78
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Gain on sale of business
Before Tax:
Reclassification to earnings			$ 4
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Other Income [Member]
Before Tax:
Reclassification to earnings		$ (2)

[1] For 2022, $(2) of the pre-tax amount of $(7) is classified in other income in the accompanying consolidated statements of operations. Otherwise, the pre-tax amount for each year is classified as sales.

[2] For 2021, $4 of the pre-tax amount of $30 is classified in gain on sale of business in the accompanying consolidated statements of operations. Otherwise, the pre-tax amount for each year is classified as non-operating postretirement expense.