Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2024		Apr. 30, 2023	Apr. 30, 2022
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 7		$ 13	$ 7
Additions Charged to Costs and Expenses	1		0	7
Additions Charged to Other Accounts	0		0	0
Deductions	0	[1]	6	1	[1]
Balance at End of Period	8		7	13
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	14		27	20
Additions Charged to Costs and Expenses	2		4	8
Additions Charged to Other Accounts	2		0	0
Deductions	2		17	1
Balance at End of Period	$ 16		$ 14	$ 27

[1] Doubtful accounts written off, net of recoveries.