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Pension and Other Postretirement Benefits (Funded Status of Plans) (Details) - USD ($) $ in Millions	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Funded Status of Plans
Assets	$ 836	$ 749
Pension Benefits [Member]
Funded Status of Plans
Assets	836	749	$ 754
Obligations	(1,012)	(1,005)	(908)
Funded status	(176)	(256)
Medical and Life Insurance Benefits [Member]
Funded Status of Plans
Assets	0	0	0
Obligations	(49)	(51)	$ (50)
Funded status	$ (49)	$ (51)

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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