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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, 2021	Apr. 30, 2020
Change in fair value of Level 3 Assets
Beginning balance	$ 749
Ending balance	836	$ 749
Level 3 [Member]
Change in fair value of Level 3 Assets
Beginning balance	2	3
Return on assets held at end of year	1
Sales and settlements	(1)	(1)
Ending balance	$ 2	$ 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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