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Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Jan. 31, 2018
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
 
Nine Months Ended
 
January 31,
 
January 31,
(Dollars in millions)
2017
 
2018
 
2017
 
2018
Pension Benefits:
 
 
 
 
 
 
 
Service cost
$
6

 
$
6

 
$
19

 
$
18

Interest cost
9

 
7

 
26

 
22

Expected return on plan assets
(10
)
 
(10
)
 
(31
)
 
(31
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost (credit)
—

 
—

 
1

 
—

Net actuarial loss
6

 
6

 
19

 
16

Settlement loss
1

 
—

 
1

 
—

Net cost
$
12

 
$
9

 
$
35

 
$
25

 
 
 
 
 
 
 
 
Other Postretirement Benefits:
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
1

 
$
1

Interest cost
1

 
1

 
2

 
1

Amortization of prior service cost (credit)
(1
)
 
(1
)
 
(2
)
 
(2
)
Net cost
$
—

 
$
—

 
$
1

 
$
—