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Other Comprehensive Income
 9 Months Ended
Jan. 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
 
January 31, 2016
 
January 31, 2017
(Dollars in millions)
Pre-Tax
 
Tax
 
Net
 
Pre-Tax
 
Tax
 
Net
Currency translation adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on currency translation
$
(30
)
 
$
—

 
$
(30
)
 
$
(27
)
 
$
2

 
$
(25
)
Reclassification to earnings
—

 
—

 
—

 
—

 
—

 
—

Other comprehensive income (loss), net
(30
)
 
—

 
(30
)
 
(27
)
 
2

 
(25
)
Cash flow hedge adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on hedging instruments
29

 
(11
)
 
18

 
5

 
(3
)
 
2

Reclassification to earnings1
(17
)
 
7

 
(10
)
 
(15
)
 
6

 
(9
)
Other comprehensive income (loss), net
12

 
(4
)
 
8

 
(10
)
 
3

 
(7
)
Postretirement benefits adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net actuarial gain (loss) and prior service cost
—

 
—

 
—

 
2

 
(1
)
 
1

Reclassification to earnings2
7

 
(2
)
 
5

 
7

 
(2
)
 
5

Other comprehensive income (loss), net
7

 
(2
)
 
5

 
9

 
(3
)
 
6

 
 
 
 
 
 
 
 
 
 
 
 
Total other comprehensive income (loss), net
$
(11
)
 
$
(6
)
 
$
(17
)
 
$
(28
)
 
$
2

 
$
(26
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended
 
Nine Months Ended
 
January 31, 2016
 
January 31, 2017
(Dollars in millions)
Pre-Tax
 
Tax
 
Net
 
Pre-Tax
 
Tax
 
Net
Currency translation adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on currency translation
(57
)
 
(1
)
 
(58
)
 
(99
)
 
(11
)
 
(110
)
Reclassification to earnings
—

 
—

 
—

 
—

 
—

 
—

Other comprehensive income (loss), net
(57
)
 
(1
)
 
(58
)
 
(99
)
 
(11
)
 
(110
)
Cash flow hedge adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on hedging instruments
74

 
(26
)
 
48

 
57

 
(23
)
 
34

Reclassification to earnings1
(46
)
 
18

 
(28
)
 
(34
)
 
14

 
(20
)
Other comprehensive income (loss), net
28

 
(8
)
 
20

 
23

 
(9
)
 
14

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

 
—

 
—

 
2

 
(1
)
 
1

Reclassification to earnings2
23

 
(8
)
 
15

 
19

 
(7
)
 
12

Other comprehensive income (loss), net
23

 
(8
)
 
15

 
21

 
(8
)
 
13

 
 
 
 
 
 
 
 
 
 
 
 
Total other comprehensive income (loss), net
$
(6
)
 
$
(17
)
 
$
(23
)
 
$
(55
)
 
$
(28
)
 
$
(83
)
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).