Derivative Financial Instruments and Hedging Activities Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Apr. 30, 2025	Apr. 30, 2024
Offsetting Assets and Liabilities [Line Items]
Gross Amount of Derivative Assets	$ 4	$ 12
Gross Amount of Derivative Liabilities Offset Against Derivative Assets in Balance Sheet	(2)	(3)
Net Amount of Derivative Assets Presented in Balance Sheet	2	9
Gross Amount of Derivative Liabilities Not Offset Against Derivative Assets in Balance Sheet	0	0
Net Amount of Derivative Assets	2	9
Gross Amount of Derivative Liabilities	(14)	(4)
Gross Amount of Derivative Assets Offset Against Derivative Liabilities in Balance Sheet	2	3
Net Amount of Derivative Liabilities Presented in Balance Sheet	(12)	(1)
Gross Amount of Derivative Assets Not Offset Against Derivative Liabilities in Balance Sheet	0	0
Net Amount of Derivative Liabilities	$ (12)	$ (1)
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