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Other Comprehensive Income
 9 Months Ended
Jan. 31, 2019
Statement of Comprehensive Income [Abstract]  
Comprehensive Income (Loss) Note [Text Block]
Other Comprehensive Income
The following tables show the components of net other comprehensive income (loss):
 
Three Months Ended
 
Three Months Ended
 
January 31, 2018
 
January 31, 2019
(Dollars in millions)
Pre-Tax
 
Tax
 
Net
 
Pre-Tax
 
Tax
 
Net
Currency translation adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on currency translation
$
24

 
$
14

 
$
38

 
$
16

 
$
2

 
$
18

Reclassification to earnings
—

 
—

 
—

 
—

 
—

 
—

Other comprehensive income (loss), net
24

 
14

 
38

 
16

 
2

 
18

Cash flow hedge adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on hedging instruments
(51
)
 
18

 
(33
)
 
(5
)
 
1

 
(4
)
Reclassification to earnings1
1

 
—

 
1

 
(5
)
 
1

 
(4
)
Other comprehensive income (loss), net
(50
)
 
18

 
(32
)
 
(10
)
 
2

 
(8
)
Postretirement benefits adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net actuarial gain (loss) and prior service cost
—

 
—

 
—

 
(25
)
 
6

 
(19
)
Reclassification to earnings2
5

 
(2
)
 
3

 
18

 
(4
)
 
14

Other comprehensive income (loss), net
5

 
(2
)
 
3

 
(7
)
 
2

 
(5
)
 
 
 
 
 
 
 
 
 
 
 
 
Total other comprehensive income (loss), net
$
(21
)
 
$
30

 
$
9

 
$
(1
)
 
$
6

 
$
5

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended
 
Nine Months Ended
 
January 31, 2018
 
January 31, 2019
(Dollars in millions)
Pre-Tax
 
Tax
 
Net
 
Pre-Tax
 
Tax
 
Net
Currency translation adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on currency translation
$
27

 
$
20

 
$
47

 
$
(12
)
 
$
(9
)
 
$
(21
)
Reclassification to earnings
—

 
—

 
—

 
—

 
—

 
—

Other comprehensive income (loss), net
27

 
20

 
47

 
(12
)
 
(9
)
 
(21
)
Cash flow hedge adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on hedging instruments
(80
)
 
29

 
(51
)
 
51

 
(12
)
 
39

Reclassification to earnings1
4

 
(1
)
 
3

 
(3
)
 
1

 
(2
)
Other comprehensive income (loss), net
(76
)
 
28

 
(48
)
 
48

 
(11
)
 
37

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

 
—

 
—

 
(25
)
 
6

 
(19
)
Reclassification to earnings2
15

 
(6
)
 
9

 
27

 
(6
)
 
21

Other comprehensive income (loss), net
15

 
(6
)
 
9

 
2

 
—

 
2

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

 
$
8

 
$
38

 
$
(20
)
 
$
18

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.