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Pension and Other Postretirement Benefits (Tables)
3 Months Ended
Jul. 31, 2022
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The following table shows the components of the net cost recognized for our U.S. pension plans. Similar information for other defined benefit plans is not presented due to immateriality.
Three Months Ended
July 31,
(Dollars in millions)20212022
Service cost$$
Interest cost
Expected return on plan assets(11)(11)
Amortization of net actuarial loss
Net cost$$