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Other Comprehensive Income (Tables)
 3 Months Ended
Jul. 31, 2020
Statement of Comprehensive Income [Abstract]  
Comprehensive Income (Loss) [Table Text Block]
The following tables show the components of net other comprehensive income (loss):
 
Three Months Ended
 
Three Months Ended
 
July 31, 2019
 
July 31, 2020
(Dollars in millions)
Pre-Tax
 
Tax
 
Net
 
Pre-Tax
 
Tax
 
Net
Currency translation adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on currency translation
$
(8
)
 
$
(5
)
 
$
(13
)
 
$
53

 
$
9

 
$
62

Reclassification to earnings
—

 
—

 
—

 
—

 
—

 
—

Other comprehensive income (loss), net
(8
)
 
(5
)
 
(13
)
 
53

 
9

 
62

Cash flow hedge adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss) on hedging instruments
15

 
(3
)
 
12

 
(49
)
 
12

 
(37
)
Reclassification to earnings1
(4
)
 
1

 
(3
)
 
(11
)
 
3

 
(8
)
Other comprehensive income (loss), net
11

 
(2
)
 
9

 
(60
)
 
15

 
(45
)
Postretirement benefits adjustments:
 
 
 
 
 
 
 
 
 
 
 
Net actuarial gain (loss) and prior service cost
—

 
—

 
—

 
—

 
—

 
—

Reclassification to earnings2
4

 
(1
)
 
3

 
10

 
(3
)
 
7

Other comprehensive income (loss), net
4

 
(1
)
 
3

 
10

 
(3
)
 
7

 
 
 
 
 
 
 
 
 
 
 
 
Total other comprehensive income (loss), net
$
7

 
$
(8
)
 
$
(1
)
 
$
3

 
$
21

 
$
24

1Pre-tax amount is classified as sales in the accompanying condensed consolidated statements of operations.
2For three months ended July 31, 2019, the pre-tax amount of $4 is classified as non-operating postretirement expense in the accompanying condensed consolidated statements of operations. For three months ended July 31, 2020, $6 of the pre-tax amount is classified as non-operating postretirement expense; $4 of the pretax amount is classified in gain on sale of business.