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Other Comprehensive Income
 6 Months Ended
Oct. 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
 
October 31, 2016
 
October 31, 2017
(Dollars in millions)
Pre-Tax
 
Tax
 
Net
 
Pre-Tax
 
Tax
 
Net
Currency translation adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on currency translation
$
(4
)
 
$
(14
)
 
$
(18
)
 
$
(25
)
 
$
—

 
$
(25
)
Reclassification to earnings
—

 
—

 
—

 
—

 
—

 
—

Other comprehensive income (loss), net
(4
)
 
(14
)
 
(18
)
 
(25
)
 
—

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

 
(9
)
 
14

 
7

 
(3
)
 
4

Reclassification to earnings1
(9
)
 
4

 
(5
)
 
5

 
(2
)
 
3

Other comprehensive income (loss), net
14

 
(5
)
 
9

 
12

 
(5
)
 
7

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

 
—

 
—

 
(1
)
 
—

 
(1
)
Reclassification to earnings2
7

 
(3
)
 
4

 
6

 
(2
)
 
4

Other comprehensive income (loss), net
7

 
(3
)
 
4

 
5

 
(2
)
 
3

 
 
 
 
 
 
 
 
 
 
 
 
Total other comprehensive income (loss), net
$
17

 
$
(22
)
 
$
(5
)
 
$
(8
)
 
$
(7
)
 
$
(15
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended
 
Six Months Ended
 
October 31, 2016
 
October 31, 2017
(Dollars in millions)
Pre-Tax
 
Tax
 
Net
 
Pre-Tax
 
Tax
 
Net
Currency translation adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on currency translation
(72
)
 
(13
)
 
(85
)
 
3

 
6

 
9

Reclassification to earnings
—

 
—

 
—

 
—

 
—

 
—

Other comprehensive income (loss), net
(72
)
 
(13
)
 
(85
)
 
3

 
6

 
9

Cash flow hedge adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on hedging instruments
52

 
(20
)
 
32

 
(29
)
 
11

 
(18
)
Reclassification to earnings1
(19
)
 
8

 
(11
)
 
3

 
(1
)
 
2

Other comprehensive income (loss), net
33

 
(12
)
 
21

 
(26
)
 
10

 
(16
)
Postretirement benefits adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net actuarial gain (loss) and prior service cost
—

 
—

 
—

 
—

 
—

 
—

Reclassification to earnings2
12

 
(5
)
 
7

 
10

 
(4
)
 
6

Other comprehensive income (loss), net
12

 
(5
)
 
7

 
10

 
(4
)
 
6

 
 
 
 
 
 
 
 
 
 
 
 
Total other comprehensive income (loss), net
$
(27
)
 
$
(30
)
 
$
(57
)
 
$
(13
)
 
$
12

 
$
(1
)
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).