Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Current:
U.S. federal	$ 157	$ 205	$ 146
Foreign	46	64	50
State and local	34	18	35
Current income tax expense	237	287	231
Deferred:
U.S. federal	(4)	1	(4)
Foreign	6	(9)	(47)
State and local	(5)	(3)	(2)
Deferred income taxes expense	(3)	(11)	(53)
Total income tax expense	$ 234	$ 276	$ 178