Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Current:
U.S. federal	$ 205	$ 146	$ 95
Foreign	64	50	29
State and local	18	35	19
Current income tax expense	287	231	143
Deferred:
U.S. federal	1	(4)	34
Foreign	(9)	(47)	7
State and local	(3)	(2)	(2)
Deferred income taxes expense	(11)	(53)	39
Total income tax expense	$ 276	$ 178	$ 182