Income Taxes (Loss Carryforwards) (Details) - USD ($) $ in Millions	Apr. 30, 2024		Apr. 30, 2023
Operating Loss Carryforwards [Line Items]
Loss and Credit Carryforwards	$ 271		$ 327
Deferred Tax Assets, Loss and Credit Carryforwards	65		62
Loss and Credit Carryforwards, Valuation Allowance	(16)		(14)
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Loss and Credit Carryforwards	110		111
Deferred Tax Assets, Loss and Credit Carryforwards	38	[1]	20
Loss and Credit Carryforwards, Valuation Allowance	(7)		(6)
Domestic Tax Authority | Not Subject to Expiration [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Loss and Credit Carryforwards	28
Domestic Tax Authority | Subject to Expiration [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Loss and Credit Carryforwards	10
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Loss and Credit Carryforwards	161		216
Deferred Tax Assets, Loss and Credit Carryforwards	27	[2]	42
Loss and Credit Carryforwards, Valuation Allowance	(9)		$ (8)
Foreign Tax Authority [Member] | Not Subject to Expiration [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Loss and Credit Carryforwards	25
Foreign Tax Authority [Member] | Subject to Expiration [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Loss and Credit Carryforwards	$ 2

[1] As of April 30, 2024, the deferred tax asset amount includes credit carryforwards of $28 that do not expire and loss and credit carryforwards of $10 that expire in varying amounts from 2025 to 2039.

[2] As of April 30, 2024, the deferred tax asset includes loss carryforwards of $25 that do not expire and $2 that expire in varying amounts over the next 10 years.