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Other Comprehensive Income (Tables)
 3 Months Ended
Jul. 31, 2019
Statement of Comprehensive Income [Abstract]  
Comprehensive Income (Loss) [Table Text Block]
The following table shows the components of net other comprehensive income (loss):
 
Three Months Ended
 
Three Months Ended
 
July 31, 2018
 
July 31, 2019
(Dollars in millions)
Pre-Tax
 
Tax
 
Net
 
Pre-Tax
 
Tax
 
Net
Currency translation adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on currency translation
$
(5
)
 
$
(7
)
 
$
(12
)
 
$
(8
)
 
$
(5
)
 
$
(13
)
Reclassification to earnings
—

 
—

 
—

 
—

 
—

 
—

Other comprehensive income (loss), net
(5
)
 
(7
)
 
(12
)
 
(8
)
 
(5
)
 
(13
)
Cash flow hedge adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on hedging instruments
27

 
(6
)
 
21

 
15

 
(3
)
 
12

Reclassification to earnings1
2

 
—

 
2

 
(4
)
 
1

 
(3
)
Other comprehensive income (loss), net
29

 
(6
)
 
23

 
11

 
(2
)
 
9

Postretirement benefits adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net actuarial gain (loss) and prior service cost
—

 
—

 
—

 
—

 
—

 
—

Reclassification to earnings2
4

 
(1
)
 
3

 
4

 
(1
)
 
3

Other comprehensive income (loss), net
4

 
(1
)
 
3

 
4

 
(1
)
 
3

 
 
 
 
 
 
 
 
 
 
 
 
Total other comprehensive income (loss), net
$
28

 
$
(14
)
 
$
14

 
$
7

 
$
(8
)
 
$
(1
)
1Pre-tax amount is classified as sales in the accompanying condensed consolidated statements of operations.
2Pre-tax amount is classified as non-operating postretirement expense in the accompanying condensed consolidated statements of operations.