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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Oct. 31, 2017
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The following table shows the components of the pension and other postretirement benefit cost recognized for our U.S. benefit plans. Information about similar international plans is not presented due to immateriality.
 
Three Months Ended
 
Six Months Ended
 
October 31,
 
October 31,
(Dollars in millions)
2016
 
2017
 
2016
 
2017
Pension Benefits:
 
 
 
 
 
 
 
Service cost
$
6

 
$
6

 
$
13

 
$
12

Interest cost
9

 
7

 
18

 
15

Expected return on plan assets
(10
)
 
(10
)
 
(21
)
 
(21
)
Amortization of net actuarial loss
6

 
6

 
13

 
11

Net cost
$
11

 
$
9

 
$
23

 
$
17

 
 
 
 
 
 
 
 
Other Postretirement Benefits:
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
1

 
$
—

Interest cost
1

 
1

 
1

 
1

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

 
$
—

 
$
1

 
$
—