Derivative Financial Instruments and Hedging Activities (Offsetting Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Jul. 31, 2026	Apr. 30, 2026
Offsetting Assets and Liabilities [Line Items]
Gross Amount of Derivative Assets	$ 5	$ 4
Gross Amount of Derivative Liabilities Offset Against Derivative Assets in Balance Sheet	(5)	(3)
Net Amount of Derivative Assets Presented in Balance Sheet	0	1
Gross Amount of Derivative Liabilities Not Offset Against Derivative Assets in Balance Sheet	0	0
Net Amount of Derivative Assets	0	1
Gross Amount of Derivative Liabilities	(18)	(17)
Gross Amount of Derivative Assets Offset Against Derivative Liabilities in Balance Sheet	5	3
Net Amount of Derivative Liabilities Presented in Balance Sheet	(13)	(14)
Gross Amount of Derivative Assets Not Offset Against Derivative Liabilities in Balance Sheet	0	0
Net Amount of Derivative Liabilities	$ (13)	$ (14)

Derivative Asset Fair Value Gross Liability Amount Not Offset In Balance Sheet

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[Line Items] for Offsetting Assets and Liabilities [Table]

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