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Other Comprehensive Income
 3 Months Ended
Jul. 31, 2017
Statement of Comprehensive Income [Abstract]  
Comprehensive Income (Loss) Note [Text Block]
Other Comprehensive Income
The following tables present the components of net other comprehensive income (loss):
 
Three Months Ended
 
Three Months Ended
 
July 31, 2016
 
July 31, 2017
(Dollars in millions)
Pre-Tax
 
Tax
 
Net
 
Pre-Tax
 
Tax
 
Net
Currency translation adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on currency translation
$
(68
)
 
$
1

 
$
(67
)
 
$
28

 
$
6

 
$
34

Reclassification to earnings
—

 
—

 
—

 
—

 
—

 
—

Other comprehensive income (loss), net
(68
)
 
1

 
(67
)
 
28

 
6

 
34

Cash flow hedge adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on hedging instruments
29

 
(11
)
 
18

 
(36
)
 
14

 
(22
)
Reclassification to earnings1
(10
)
 
4

 
(6
)
 
(2
)
 
1

 
(1
)
Other comprehensive income (loss), net
19

 
(7
)
 
12

 
(38
)
 
15

 
(23
)
Postretirement benefits adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net actuarial gain (loss) and prior service cost
—

 
—

 
—

 
1

 
—

 
1

Reclassification to earnings2
5

 
(2
)
 
3

 
4

 
(2
)
 
2

Other comprehensive income (loss), net
5

 
(2
)
 
3

 
5

 
(2
)
 
3

 
 
 
 
 
 
 
 
 
 
 
 
Total other comprehensive income (loss), net
$
(44
)
 
$
(8
)
 
$
(52
)
 
$
(5
)
 
$
19

 
$
14

1Pre-tax amount is classified as net sales in the accompanying consolidated statements of operations.
2Pre-tax amount is a component of pension and other postretirement benefit expense (as shown in Note 7, except for amounts related to non-U.S. benefit plans, about which no information is presented in Note 7 due to immateriality).