Derivative Financial Instruments and Hedging Activities Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Apr. 30, 2026	Apr. 30, 2025
Offsetting Assets and Liabilities [Line Items]
Gross Amount of Derivative Assets	$ 4	$ 4
Gross Amount of Derivative Liabilities Offset Against Derivative Assets in Balance Sheet	(3)	(2)
Net Amount of Derivative Assets Presented in Balance Sheet	1	2
Gross Amount of Derivative Liabilities Not Offset Against Derivative Assets in Balance Sheet	0	0
Net Amount of Derivative Assets	1	2
Gross Amount of Derivative Liabilities	(17)	(14)
Gross Amount of Derivative Assets Offset Against Derivative Liabilities in Balance Sheet	3	2
Net Amount of Derivative Liabilities Presented in Balance Sheet	(14)	(12)
Gross Amount of Derivative Assets Not Offset Against Derivative Liabilities in Balance Sheet	0	0
Net Amount of Derivative Liabilities	$ (14)	$ (12)
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