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Pension and Other Postretirement Benefits (Change in Fair Value of Level 3 Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Change in fair value of Level 3 Assets
Beginning balance	$ 741
Ending balance	606	$ 741
Level 3 [Member]
Change in fair value of Level 3 Assets
Beginning balance	2	2
Return on assets held at end of year	(1)	0
Ending balance	$ 1	$ 2

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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