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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Oct. 31, 2015
Compensation and Retirement Disclosure [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 during the periods covered by this report. Information about similar international plans is not presented due to immateriality.
 
Three Months Ended
 
Six Months Ended
 
October 31,
 
October 31,
(Dollars in millions)
2014
 
2015
 
2014
 
2015
Pension Benefits:
 
 
 
 
 
 
 
Service cost
$
5

 
$
6

 
$
11

 
$
13

Interest cost
8

 
9

 
17

 
17

Expected return on plan assets
(10
)
 
(10
)
 
(21
)
 
(20
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost
—

 
—

 
1

 
—

Net actuarial loss
6

 
7

 
11

 
14

Net cost
$
9

 
$
12

 
$
19

 
$
24

 
 
 
 
 
 
 
 
Other Postretirement Benefits:
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
1

 
$
1

Interest cost
$
1

 
$
1

 
2

 
1

Amortization of prior service cost
—

 
(1
)
 
(1
)
 
(1
)
Net cost
$
1

 
$
—

 
$
2

 
$
1