Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Current:
U.S. federal	$ 150	$ 157	$ 205
Foreign	81	46	64
State and local	25	34	18
Current income tax expense	256	237	287
Deferred:
U.S. federal	16	(4)	1
Foreign	(5)	6	(9)
State and local	7	(5)	(3)
Deferred income taxes expense	18	(3)	(11)
Total income tax expense	$ 274	$ 234	$ 276