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Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Jan. 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 and other postretirement benefit plans. Information about similar international plans is not presented due to immateriality.
Three Months EndedNine Months Ended
January 31,January 31,
(Dollars in millions)2024202520242025
Pension Benefits:
  
Service cost$5 $4 $14 $13 
Interest cost8 9 25 27 
Expected return on plan assets(10)(10)(30)(29)
Amortization of:    
Prior service cost— — — 1 
Net actuarial loss
2 1 5 1 
Curtailment loss
— 1 — 1 
Net cost$5 $5 $14 $14 
Other Postretirement Benefits:
  
Interest cost$— $— $1 $1 
Special termination benefits
— 1 — 1 
Curtailment loss
— 1 — 1 
Net cost$— $2 $1 $3