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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Oct. 31, 2025
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 EndedSix Months Ended
October 31,October 31,
(Dollars in millions)2024202520242025
Service cost$4 $4 $8 $7 
Interest cost9 7 18 15 
Expected return on plan assets(10)(8)(19)(17)
Amortization of:    
Prior service cost— 1 — 1 
Net actuarial loss
1 1 1 2 
Settlement charge— 2 — 21 
Net cost$4 $7 $8 $29