Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2023		Apr. 30, 2022	Apr. 30, 2021
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	$ 13		$ 7	$ 11
Additions Charged to Costs and Expenses	0		7	0
Additions Charged to Other Accounts	0		0	0
Deductions	6	[1]	1	4	[1]
Balance at End of Period	7		13	7
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	27		20	22
Additions Charged to Costs and Expenses	4		8	10
Additions Charged to Other Accounts	0		0	0
Deductions	17		1	12
Balance at End of Period	$ 14		$ 27	$ 20

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