Derivative Financial Instruments and Hedging Activities Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Apr. 30, 2024	Apr. 30, 2023
Offsetting Assets and Liabilities [Line Items]
Gross Amount of Derivative Assets	$ 12	$ 28
Gross Amount of Derivative Liabilities Offset Against Derivative Assets in Balance Sheet	(3)	(12)
Net Amount of Derivative Assets Presented in Balance Sheet	9	16
Gross Amount of Derivative Liabilities Not Offset Against Derivative Assets in Balance Sheet	0	(1)
Net Amount of Derivative Assets	9	15
Gross Amount of Derivative Liabilities	(4)	(14)
Gross Amount of Derivative Assets Offset Against Derivative Liabilities in Balance Sheet	3	12
Net Amount of Derivative Liabilities Presented in Balance Sheet	(1)	(2)
Gross Amount of Derivative Assets Not Offset Against Derivative Liabilities in Balance Sheet	0	1
Net Amount of Derivative Liabilities	$ (1)	$ (1)
DerivativeAssetStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag	true