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Other Comprehensive Income (Tables)
 6 Months Ended
Oct. 31, 2018
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
 
October 31, 2017
 
October 31, 2018
(Dollars in millions)
Pre-Tax
 
Tax
 
Net
 
Pre-Tax
 
Tax
 
Net
Currency translation adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on currency translation
$
(25
)
 
$
—

 
$
(25
)
 
$
(23
)
 
$
(4
)
 
$
(27
)
Reclassification to earnings
—

 
—

 
—

 
—

 
—

 
—

Other comprehensive income (loss), net
(25
)
 
—

 
(25
)
 
(23
)
 
(4
)
 
(27
)
Cash flow hedge adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on hedging instruments
7

 
(3
)
 
4

 
30

 
(8
)
 
22

Reclassification to earnings1
5

 
(2
)
 
3

 
—

 
—

 
—

Other comprehensive income (loss), net
12

 
(5
)
 
7

 
30

 
(8
)
 
22

Postretirement benefits adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net actuarial gain (loss) and prior service cost
(1
)
 
—

 
(1
)
 
—

 
—

 
—

Reclassification to earnings2
6

 
(2
)
 
4

 
5

 
(1
)
 
4

Other comprehensive income (loss), net
5

 
(2
)
 
3

 
5

 
(1
)
 
4

 
 
 
 
 
 
 
 
 
 
 
 
Total other comprehensive income (loss), net
$
(8
)
 
$
(7
)
 
$
(15
)
 
$
12

 
$
(13
)
 
$
(1
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended
 
Six Months Ended
 
October 31, 2017
 
October 31, 2018
(Dollars in millions)
Pre-Tax
 
Tax
 
Net
 
Pre-Tax
 
Tax
 
Net
Currency translation adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on currency translation
$
3

 
$
6

 
$
9

 
$
(28
)
 
$
(11
)
 
$
(39
)
Reclassification to earnings
—

 
—

 
—

 
—

 
—

 
—

Other comprehensive income (loss), net
3

 
6

 
9

 
(28
)
 
(11
)
 
(39
)
Cash flow hedge adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on hedging instruments
(29
)
 
11

 
(18
)
 
57

 
(14
)
 
43

Reclassification to earnings1
3

 
(1
)
 
2

 
2

 
—

 
2

Other comprehensive income (loss), net
(26
)
 
10

 
(16
)
 
59

 
(14
)
 
45

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

 
—

 
—

 
—

 
—

 
—

Reclassification to earnings2
10

 
(4
)
 
6

 
9

 
(2
)
 
7

Other comprehensive income (loss), net
10

 
(4
)
 
6

 
9

 
(2
)
 
7

 
 
 
 
 
 
 
 
 
 
 
 
Total other comprehensive income (loss), net
$
(13
)
 
$
12

 
$
(1
)
 
$
40

 
$
(27
)
 
$
13

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.