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Other Comprehensive Income
 9 Months Ended
Jan. 31, 2018
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, 2017
 
January 31, 2018
(Dollars in millions)
Pre-Tax
 
Tax
 
Net
 
Pre-Tax
 
Tax
 
Net
Currency translation adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on currency translation
$
(27
)
 
$
2

 
$
(25
)
 
$
24

 
$
14

 
$
38

Reclassification to earnings
—

 
—

 
—

 
—

 
—

 
—

Other comprehensive income (loss), net
(27
)
 
2

 
(25
)
 
24

 
14

 
38

Cash flow hedge adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on hedging instruments
5

 
(3
)
 
2

 
(51
)
 
18

 
(33
)
Reclassification to earnings1
(15
)
 
6

 
(9
)
 
1

 
—

 
1

Other comprehensive income (loss), net
(10
)
 
3

 
(7
)
 
(50
)
 
18

 
(32
)
Postretirement benefits adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net actuarial gain (loss) and prior service cost
2

 
(1
)
 
1

 
—

 
—

 
—

Reclassification to earnings2
7

 
(2
)
 
5

 
5

 
(2
)
 
3

Other comprehensive income (loss), net
9

 
(3
)
 
6

 
5

 
(2
)
 
3

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

 
$
(26
)
 
$
(21
)
 
$
30

 
$
9

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended
 
Nine Months Ended
 
January 31, 2017
 
January 31, 2018
(Dollars in millions)
Pre-Tax
 
Tax
 
Net
 
Pre-Tax
 
Tax
 
Net
Currency translation adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on currency translation
$
(99
)
 
$
(11
)
 
$
(110
)
 
$
27

 
$
20

 
$
47

Reclassification to earnings
—

 
—

 
—

 
—

 
—

 
—

Other comprehensive income (loss), net
(99
)
 
(11
)
 
(110
)
 
27

 
20

 
47

Cash flow hedge adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on hedging instruments
57

 
(23
)
 
34

 
(80
)
 
29

 
(51
)
Reclassification to earnings1
(34
)
 
14

 
(20
)
 
4

 
(1
)
 
3

Other comprehensive income (loss), net
23

 
(9
)
 
14

 
(76
)
 
28

 
(48
)
Postretirement benefits adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net actuarial gain (loss) and prior service cost
2

 
(1
)
 
1

 
—

 
—

 
—

Reclassification to earnings2
19

 
(7
)
 
12

 
15

 
(6
)
 
9

Other comprehensive income (loss), net
21

 
(8
)
 
13

 
15

 
(6
)
 
9

 
 
 
 
 
 
 
 
 
 
 
 
Total other comprehensive income (loss), net
$
(55
)
 
$
(28
)
 
$
(83
)
 
$
(34
)
 
$
42

 
$
8

1Pre-tax amount is classified as 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).