Other Comprehensive Income Schedule of Other Comprehensive Income (Details) - USD ($) $ in Millions		12 Months Ended
		Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Before Tax:
Net other comprehensive income (loss)		$ 128	$ 108	$ (151)
Tax Effect:
Net other comprehensive income (loss)		(58)	17	10
Net of Tax:
Net other comprehensive income (loss)		70	125	(141)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Before Tax:
Net gain (loss)		(42)	106	(88)
Reclassification to earnings		0	0	0
Net other comprehensive income (loss)		(42)	106	(88)
Tax Effect:
Net gain (loss)		(18)	17	(6)
Reclassification to earnings		0	0	0
Net other comprehensive income (loss)		(18)	17	(6)
Net of Tax:
Net gain (loss)		(60)	123	(94)
Reclassification to earnings		0	0	0
Net other comprehensive income (loss)		(60)	123	(94)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Before Tax:
Net gain (loss)		76	(78)	61
Reclassification to earnings	[1]	(7)	(21)	(23)
Net other comprehensive income (loss)		69	(99)	38
Tax Effect:
Net gain (loss)		(17)	17	(14)
Reclassification to earnings		1	6	6
Net other comprehensive income (loss)		(16)	23	(8)
Net of Tax:
Net gain (loss)		59	(61)	47
Reclassification to earnings		(6)	(15)	(17)
Net other comprehensive income (loss)		53	(76)	30
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Before Tax:
Net gain (loss)		67	71	(119)
Reclassification to earnings	[2]	34	30	18
Net other comprehensive income (loss)		101	101	(101)
Tax Effect:
Net gain (loss)		(16)	(16)	28
Reclassification to earnings		(8)	(7)	(4)
Net other comprehensive income (loss)		(24)	(23)	24
Net of Tax:
Net gain (loss)		51	55	(91)
Reclassification to earnings		26	23	14
Net other comprehensive income (loss)		77	78	$ (77)
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.