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Pension and Other Postretirement Benefits
 3 Months Ended
Jul. 31, 2018
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits
Pension and Other Postretirement Benefits 
The following table shows the components of the net cost of pension and other postretirement benefits recognized for our U.S. benefit plans. Information about similar international plans is not presented due to immateriality.
 
Three Months Ended
 
July 31,
(Dollars in millions)
2017
 
2018
Pension Benefits:
 
 
 
Service cost
$
6

 
$
6

Interest cost
7

 
9

Expected return on plan assets
(10
)
 
(12
)
Amortization of net actuarial loss
5

 
5

Net cost
$
8

 
$
8

 
 
 
 
Other Postretirement Benefits:
 
 
 
Interest cost
$
1

 
$
1

Amortization of prior service cost (credit)
(1
)
 
(1
)
Net cost
$
—

 
$
—