Derivative Financial Instruments and Hedging Activities- Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Jan. 31, 2026	Apr. 30, 2025
Offsetting Assets and Liabilities [Line Items]
Gross Amount of Derivative Assets	$ 1	$ 4
Gross Amount of Derivative Liabilities Offset Against Derivative Assets in Balance Sheet	0	(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	(21)	(14)
Gross Amount of Derivative Assets Offset Against Derivative Liabilities in Balance Sheet	0	2
Net Amount of Derivative Liabilities Presented in Balance Sheet	(21)	(12)
Gross Amount of Derivative Assets Not Offset Against Derivative Liabilities in Balance Sheet	0	0
Net Amount of Derivative Liabilities	$ (21)	$ (12)